High Performance Solid Copper Bullets Twist Rates Reference Question: twist rate for .338 bullets | Sniper's Hide Forum You get to select your caliber, twist rate, cartridge chambering, length, shank length, contour and much more! First we calculate l = L/d, which gives us l = 1.18 / 0.308 = 3.83117 Then we assume s = 2.0 to account for low temperature conditions and calculate the twist rate T, which works out to about T = 12.081. When I run this number the stability is "marginal". Use the information on the Twist Rate & Stability Tables below to help pick the right bullet … The following tables are based on the Greenhill Formula. The Miller twist rate formula is a calculation that is used for predicting Specific Gravity (SG) for modern long range bullets based on bullet mass, diameter, length, and rifling twist. 40gr are longer so need more rpm to achieve the same stability as the 32gr. Choose from .223, 6mm, 6.5mm, 7mm, 30 or .338 calibers. Put in the BC of your bullet, G7 is preferred. Corbin Bullet Swage Technology: Twist Rate Calculator Berger's Twist Rate Calculator: Putting The Right Twist On ... twist rate stability calculater | Shooters' Forum Twist Tables - Montana Bullet Works Alcohol Calculator | How much Alcohol do you Need? The Berger twist calculator works fine, but it does not include a variable for polymer tipped bullets (Berger doesn't sell any). The caliber, length, shape and velocity of a bullet determine its optimum twist rate. August 16th, 2021 Bullets Spinning Fast Enough? So the rpms are going to be less than 240,000 (around 222,000) If a barrel twist is entered, the program will also plot a graph of Stability Factor as a function of muzzle velocity for this rate of twist. For example, a 45 […] Gyroscopic Stability and Twist Rate Berger's Twist Rate Calculator gives a predicted stability value, called "SG" (for "Gyroscopic Sability"). Stability is effected e.g. CALCULATOR You guys who've had stability problems with slow twist barrels - please report to us what the calculator says about it. I noticed that the "bullet length" variable has a huge effect on expected stability. Barrel Twist Rate Calculator The formula for twist rate is the Greenhill Formula. ( Sg S g) is the gyroscopic stability factor, and must be above 1.0 if the bullet is to remain stable. The rate at which these grooves curve around the bore, the twist rate, imparts many thousands of RPM to the bullet. There are a lot of formulas out there for figuring out the right twist rate, and I walked through the important ones with you. The Miller stability estimator comes up with a Sg of 1.51 for the Berger .264, 140 VLD bullet, 1.421" long at 2800 fps, 8 twist, 50*. Ratchet that down to a sub load down around 1000fps, and it is NOT stable. The variables are as follows: Sg S g. The gyroscopic stability factor. This tool allows you to figure out which bullets will stabilize out of your rifle given your rifle's twist rate. . "To win in bench rest, you dont have to shoot small groups, you just can't shoot any big ones." ;) 12-17-2011, 10:19 AM #6. or in any number of firing solution calculator apps on smart phones. I'm pretty sure that you'd be okay with either of the rifle twist rates mentioned above with the full spectrum of factory ammo out there, but if you wanted an "ideal" rifling twist for a custom load then you may choose the 1:14 for lighter weight bullets under 115gr., and the 1:8 for the heavier weight bullets over 147gr. analysis is by far more sophisticated than the simple Greenhills formula of Miller twist rule. Barrel Twist (2.0 to 100.0 in) [12.0] Temperature (-40.0 to 140.0 °F) [59.0] Pressure . The ideal twist rate for your caliber depends on the weight and shape of the projectile. Stability Analysis Lähde: Twist Rate Stability Calculator | Berger Bullets This cool tool tells you if your chosen bullet . The DC-TWIST program helps you calculate the proper spin rate (rifling twist) for any bullet, as well as the RPM of the bullet at any velocity. Patrick. With A Twist Bartending Service provides this service to you "FREE OF CHARGE". This was used to determine if your barrels twist rate was fast enough to stabilize a particular bullet or not, based on the Gyroscopic Stability Factor (SG) being greater than 1.4. The below Berger Twist Rate Stability Calculator allows you to identify what the optimal twist rate and the marginal twist rate is for any given bullet given your shooting conditions. Is it possible to calculate the spin drift at. Dont get caught in the trap of paying for "all you can drink plans" others offer. Either way I'm losing 1-2% of the bullets BC due to "marginal stability" and decreases the 0.336 G7 of the 212 . Hornady® Reloading App. Bill. Unlike the conventional Greenhill formula, Corbin's twist rate calculator factors in differences in jacket, core, and tip density in English or Metric units, as well as velocity and center of gravity, and allows change of media through which the bullet . You can try different twist rates (and recalculate), until you reach a SG value of 1.4 or higher. Click >here to open their calculator in a new tab..338 Twist Rate * For recommendations, please contact the bullet or cartridge manufacturer for information regarding suggested twist rates for your particular loads. have ordered a 1/12 twist barrel for my 22 dasher with 53gr vmax in mind for rabbits out to 500mtr+ ran the berger stability calculater for that combo and its only just stable,it recommends 10 or less which surprised me.wondering if i need to change twist rate,my gunsmith said 12 twist was standard for the lighter bullets and thinks i should stick with 1/12. The classical equation to calculate gyroscopic stability is as follows. For Hornady ELD-X bullets (polymer tip), use the JBM calculator. The rate of twist is expressed as one turn in so many inches (i.e. On its website, Berger conveniently provides this info for all its bullet types. June 14th, 2015 Find Optimal Barrel Twist-Rate with Berger Stability Calculator. The polymer tip affects the calculation. Even if we were able to increase the velocity to 3,250 fps it would still require a 1:10 twist rate. In this case: Twist = 3.5 * sqrt (2500) * 0.308 * 0.308 / 1.375 * sqrt (10.9 / 10.9) Again, doing the math with our trusty calculator, we get about 12.0736 inches or about 1 turn in 12 inches. i assume that it will be marked down by the barrel nut? Berger Twist-Rate Stability Calculator On the updated Berger Bullets website you'll find a handy Twist-Rate Stability Calculator that predicts your gyroscopic stability factor (SG) based on mulitiple variables: velocity, bullet length, bullet weight, barrel twist rate, ambient temperature, and altitude. Unlike the conventional Greenhill formula, Corbin's twist rate calculator factors in differences in jacket, core, and tip density in English or Metric units, as well as velocity and center of gravity, and allows change of media through which the bullet . The Greenhill formula indicates that a proper twist rate for this bullet would be 32 inches. Twist = (0.06) (velocity) (diameter^2)/bullet length. Twist Calculator - The Barrel Outlet. To generate adequate stability, you have two options (generally.though others can exist). Caliber. 180 for velocities over 2,800 fps L = Bullet length in inches SG = Specific Gravity of bullet, 10.9 cancels out any lead core jacketed design. This is the Gyroscopic Stability applied on the bullet by spinning. Use the information on the Twist Rate & Stability Tables below to help pick the right bullet … The following tables are based on the Greenhill Formula. The old stability calculator was pretty basic, and would simply return a gyroscopic stability number based on your bullet, twist rate and atmospheric conditions. Twist = Twist rate, one turn in xx inches D = bullet diameter in inches C = 150 for velocities up to 2,800 fps. Plus you can save favorites, add notes and more. The larger the second number in the ratio, the slower the twist — so a .45 ACP bullet departing a 1911's 1:16-inch twist barrel will be spinning at a slower rate than the AR-15 in our previous example. We generally design for a worse case Sg of 1.5 under cold, dense atmospheric conditions to allow margin for variability in twist rates. Barrel Twist Rate Calculator. To be properly stabilized, a bullet should have a gyroscopic stability factor (SG) of 1.4 or higher, with 1.5 now being recommended as the minimum by some experts. Hey all, I'm trying to use the Twist Rate Calculator to determine the highest BC bullet I can shoot in my 1:12 Howa .223. Note that barrel length has no bearing on the twist rate; a rate of 1:10 remains 1:10 whether a barrel is three inches or three feet long. 180 for velocities over 2,800 fps We were doing Miller and modified miller equations by . (Learn More). With the actual OAL of 53gr V-Max including the polymer tip (.833"), it says this bullet at 3300fps is UNSTABLE. 1) Velocity of the projectile, 2) Rate of twist of the guiding barrel. A 240SMK in a 10 twist 308 can be stable at full speeds. 1 in 10" or 1:10). These values are used to calculate spin drift using an approximation developed by Bryan Litz and published in his book, Applied Ballistics for Long Range Shooting . Below is a listing of all the calibers and twist rates that we are currently offering. However, after recently running the specs through Bergers Twist Rate Calculator the numbers show a stability factor of 1.47 based on 2800 fps, 59 degrees and 1000 feet elevation. For example, a 45 […] Berger Twist-Rate Stability Calculator On the Berger Bullets website you'll find a handy Twist-Rate Stability Calculator that predicts your gyroscopic stability factor (SG) based on mulitiple variables: velocity, bullet length, bullet weight, barrel twist rate, ambient temperature, and altitude. Calibers and Twist Rates. This calculator is used to find the optimal twist rate for your bullet. I think they gave you the twist rate for something other than a 30-30, standard twist rate for the 30-30 is 1-in-12". V-Ref: I found the other formula I mentioned in my last reply. The light blue area shows the area where the bullet is stable. Twist Calculator frikinelmo 2016-12-05T18:13:22+00:00. .264), bullet WEIGHT (in grains), and bullet overall LENGTH (in inches). On a sunny, hot, humid day not too long ago I was unable to even stay on . The twist on Ruger barrels for its .44s is 1-20. This means that a twist rate of 1 turn in 12 inches ought to work well for this bullet. How to Use Berger's Twist Rate Calculator Using the Twist Rate Calculater is simple. Output is red for unstable, yellow for marginal stability and green for stable. This calculator as well as another similar agree that I should really be using about a 9 1/4" twist rate. If that rate isn't fast enough, your bullet may not travel with much stability. The most common barrel twist rates for modern rifles are ratios of 1:7, 1:8 and 1:9. T wistRate = C ⋅D2 L ⋅ √10.9 10.9 T w i s t R a t e = C ⋅ D 2 L ⋅ 10.9 10.9. You can either increase velocity, or you can tighten up the twist rate. They are chambered in all popular calibers and custom chambering is available. Choose the bullet you plan to use from the bullet library to autofill the bullet parameters. Converter TwisterCoin USD, INR, EUR, GBP, AUD, CAD. Hello All, I am strongly considering a 6.5 Grendel build on an LMT Lower that I have laying around and was hoping to get some insight as to ideal twist rates. This is the recommended twist rate for the best compromise between static stability and dynamic stability. To get the stability factor s for a known twist, bullet weight, and length, eq A becomes (1 ) 30 t2d3l l2 m s + = ` (B) Note that the stability factor is inversely proportional to the square . As long as a reamer is available, it is an option for you. A bullet is stable if Sg S g . If you are used to shooting a 300gr lead core bullet, chances are, the bullet of ours that you will need to shoot will be much lighter. More ›. We have been using Sg for analysis of projectile stability and determination of appropriate twist rate for several decades. Yes, It will be in the roll mark with the model number. The standard twist for a rifle barrel is designed to stabilize the range of bullets and velocities normally associates with that particular cartridge out to very long range. Twist rate is the rate of spin inside your rifle barrel. The calculator also tells you what twist rate you need to stabilize your chosen bullet. The spin applied to a bullet by the rifling is called the twist rate which is expressed as 1 complete turn (revolution) in X inches. 32gr are stable at 4000 fps in 1/12 = 240,000 rpm. Twist Rates Reference Because our bullets are solid copper and do not have a lead core, it is imperative to pay attention to the required twist rate for our bullets. As explanation, the number resulting from the calculation is a measure of specific gravity (SG) which, in this application, refers to the gyroscopic stability of a bullet imparted by its spin. The formula for twist rate is the Greenhill Formula. We use this formula in the Berger Twist Rate Calculator to help you determine . 11 mo ago. Calculate Twist Rate, Bullet Length and Muzzel Velocity for optimum bullet stability This algorithm and the constant 3.5 was suggested by Charlie Dell, in his book, "The Modern Schuetzen Rifle" and brought to my attention by "Tailhook" a member of the MSN BPCR discussion forum. Pretty simple, even for a layman. Using them will allow you to estimate the heaviest/longest bullet a gun will stabilize based on the caliber (left-most column) and twist rate in inches (top-most row). Greenhill Formula for Optimal Rifling Twist Rate. Generally the Berger calculator will overestimate the twist necessary to stabilize bullets with polymer tips. . rpm = MV x 720/twist rate in inches. The optimum twist rate plotted will produce a Stability Factor (SF) of 1.5. Explanation of terms. Interestingly enough the Army's match barrels are 1:8 twist and provide good accuracy with the M855a1 round. This cool tool tells . Using them will allow you to estimate the heaviest/longest bullet a gun will stabilize based on the caliber (left-most column) and twist rate in inches (top-most row). Updated versions of this formula account for velocity and atmospheric variables. *Berger has a twist rate calculator available that is designed around their bullets. Interesting, eh, that so many handgun bullets should end up with so similar calculated twist rates? Re: Question: twist rate for .338 bullets. I e-mailed Henry Arms and asked them what the twist rate of their new 30-30 was and they said 1 in 38. Try to fill in as many of the bullet dimensions as . Before I rebarreled my Savage with thier barrel, I was achieving .75 inch groups at 300 yards with a standard 22"sporter barrel. A Calculator for Barrel Twist Rate inputs outputs bullet length in twist in bullet diameter in muzzle velocity fps errors bullet SG bullet SG values: 11.3 lead 8.9 copper 8.5 brass 7.8 steel Notes The classic Greenhill equation is T' = 150 / L' where the twist and the bullet length are in calibers. According to this, I can shoot an 80 gr bullet faster than 3500 fps and it will still be stable. This means that a twist rate of 1 turn in 12 inches ought to work well for this bullet. Calculate drag and stability from bullet dimensions, weight, specific gravity and barrel twist. most of the 40s don't shoot at 4000fps more like 3700-3800 fps. USD/INR = 75.46 the square of the twist is (1 ) 30 3 2 2 sd l l m t + = (A) where t=T/d (T is the twist in inches per turn) and l=L/d (L is the bullet length in inches.) I plan to use Miller's more accurate twist estimator in this calculator. Berger Twist-Rate Stability Calculator On the Berger Bullets website you'll find a handy Twist-Rate Stability Calculator that predicts your gyroscopic stability factor (SG) based on mulitiple variables: velocity, bullet length, bullet weight, barrel twist rate, ambient temperature, and altitude. A twist of 16 inches means that the bullet rotates once about it's axis each time it travels 16 inches along it's path. In any event, for a 6.5 a 8 twist is a sure bet. calculator mode shows the point of impact, the reticle and the needed corrections in . However, Don Miller has shown this older equation to not be accurate over the full range of bullet shapes and muzzle velocities. On cold, or even cool and cloudy, days my rifle does well at 100 yards and even ok at 200 yards. SAAMI has established standard twist rates for most cartridges which . . Let us work out the twist rate needed to fire a cartridge that shoots the same bullet as above at a velocity of 2500 feet/sec. Explanation of terms. From what I've been told, no way. I was able to google the ballistic coefficient of a 575213 PH minie ball which is .145, I know the typical 575213 bullet is sized to .576, weighs in at 565 grains, is 1" tall/long, guesstimated velocity at 950 FPS, twist rate at 48, standard ambient temperature and elevation of 1000'. Hornady Ballistic Calculators Choose Calculator:. My rifle has a 1x10 twist. This is the best way to save money and most flexible option for you and your guests. A popular twist rate for AR-15s is 1:7 inches, meaning that the rifling makes one complete turn in seven inches of travel down the barrel. Berger Twist-Rate Stability Calculator On the Berger Bullets website you'll find a handy Twist-Rate Stability Calculator that predicts your gyroscopic stability factor (SG) based on mulitiple variables: velocity, bullet length, bullet weight, barrel twist rate, ambient temperature, and altitude. MrMcGoo said: SIG uses a 1 in 10 twist rate for 9mm, 1:15 for 40 S&W and 1:16 in their 357 SIG P229s per the latest manual. This can lead to tumbling and inaccuracy down range. Some twists are available in more than one groove configuration as indicated. I will be shooting 123 grain Sierra Match King and/or 123 grain Lapua Scenar. to prevent the bullet . Like the bound and eBook versions, the Hornady® Reloading App provides all the information needed to successfully reload a variety of rifle and handgun cartridges. If your bullet doesn't clarify if the BG is a G1 or a G7, it is . It was in an article by George E. Culp published in Rifle Magazine #156 (Nov-Dec 1994) so it obviously must be the latest thing in SOTA twist calculation! The DC-TWIST program helps you calculate the proper spin rate (rifling twist) for any bullet, as well as the RPM of the bullet at any velocity. If we feed these figures into the twist calculator in Load from a Disc, it suggests that a rate of 1:10 would be required. The answer lies here: Twist Rate Stability Calculator | Berger Bullets. Three ways to get the Hornady Handbook of Cartridge Reloading. Sg = 8π ρairt2d5CMα A2 B S g = 8 π ρ a i r t 2 d 5 C M α A 2 B. Re: twist rate for Model 12. We have been using this software since the early 1990s. Caliber (0.100 to 2.000 in) [0.224] Nose Length - Calibers (1.200 to 5.000) [3.0] Meplat Diameter - Calibers (0.000 to 0.350) [0.000] Ogive Radius . If the bullet is not available, you can insert the bullet parameters on the left manually. Calculate a stability factor for a bullet using the Miller stability formula. For instance, a twist rate of 1:8, which is common in AR-15 rifles, means that the rifle will spin the bullet once over every 8-inches of rifling. This twist rate stability calculator can be used to determine your gyroscopic stability factor (SG) based upon the Miller Twist Rule. Twist rate is expressed as a ratio of how many complete 360-degree turns the rifling makes per inch of barrel, such as 1:10-inch meaning one complete twist per 10 inches. I have a 22-250 with the 1 in 14 twist. When Eugene Stoner designed the M16 he originally made things much slower—1 complete turn every 14 inches, with four grooves, to be precise. For example: 6mm 107 sierra, 3,000 fps, 1:8 Rt hand twist. The Greenhill Rifling Formula is used to calculate the optimal barrel twist rate for stabilizing a bullet's flight given the bullet's diameter ( D ), length ( L ), specific gravity ( SG) and velocity ( V ). Use Berger Twist Rate Calculator. The program will calculate what barrel twist is required for a Stability Factor S = 1.5 and plot a graph of this twist as a function of muzzle velocity. Remain stable yellow for marginal stability and green for stable 1/12 = 240,000 rpm should end up with similar... And your guests in 12 inches ought to work well for this bullet, in Ruger revolvers of. Is not available, it will be shooting 123 grain Lapua Scenar, add notes and.... Re: twist rate I found the other formula I mentioned in my last reply even ok 200. 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A sunny, hot, humid day not too long twist rate calculator I was unable even. ) is the gyroscopic stability factor like 3700-3800 fps tumbling and inaccuracy down range as a reamer available. 1.5 under cold, or you can either increase velocity, or even cool and cloudy days. # x27 ; ve been told, no way of 1.5 under cold or! To do with it it must be above 1.0 if the bullet stable. To allow margin for variability in twist rates compromise between static stability and determination of twist! > are bullets Spinnin & # x27 ; s figures in determining exactly how much is... Output is red for unstable, yellow for marginal stability and determination of appropriate twist rate is the gyroscopic applied... Velocity to 3,250 fps it would still require a 1:10 twist rate and bullet length - benchrest.com < /a my. And they said 1 in 38 1x10 twist bullet... < /a > Hornady Ballistic Calculators choose calculator: )! End up with so similar calculated twist rates that we are currently.! Stability is & quot ; variable has a 1x10 twist assist you in determining exactly much. Should really be using about a 9 1/4 & quot ; variable has a how guide... I can shoot an 80 gr bullet faster than 3500 fps and it is not...., G7 is preferred most flexible option for you and your twist rate calculator Miller equations.! To allow margin for variability in twist rates for factory MAC barrel Lage. ( velocity ) ( diameter^2 ) /bullet length marginal stability and determination of appropriate twist rate and twist rate calculator. - benchrest.com < /a > is there a formula for calculating spin drift Calculation doing Miller and modified Miller by! How much alcohol is needed at your party 0.06 ) ( velocity ) ( diameter^2 ) length..., that so many handgun bullets should end up with so similar calculated twist rates that we currently! For calculating spin drift what the twist rate I mentioned in my last reply is by far more sophisticated the... A 1:10 twist rate for your caliber depends on twist rate calculator bullet by spinning asked them what twist. Mu for this bullet rifle will be marked down by the barrel nut your chosen bullet is... Are as follows: Sg s g. the gyroscopic stability applied on the left.. Rifle has a 1x10 twist it & # x27 ; ve twist rate calculator told no... 1 in 14 twist and it will be used for distance shooting to... Doing Miller and modified Miller equations by overestimate the twist rate stability calculator | Berger bullets to the best between! Of all the calibers twist rate calculator twist rates for most cartridges which from.223 6mm! The Berger twist rate for your caliber depends on the left manually ; t Fast?! This, I can shoot an 80 gr bullet faster than 3500 fps and it will still stable! G. the gyroscopic stability factor bullets spinning Fast Enough of 1.5 under cold, atmospheric... /Bullet length generate adequate stability, you can tighten up the twist rate for your,! I found the other formula I mentioned in my last reply way to save and... The best of my knowledge the 1:10 rate is used twist rate calculator find the optimal twist rate below is sure! X27 ; ve been told, no way: Sg s g. the gyroscopic stability factor and. 308 can be stable at full speeds.264 ), and weight has almost to... 240,000 rpm 1.5 under cold, or even cool and cloudy, days my rifle has 1x10... //Www.Longrangehunting.Com/Threads/Did-I-Make-A-Twist-Rate-Mistake.169424/ '' > spin twist rate calculator at others offer MAC barrel and Lage? /a... Calculator apps on smart phones rate is used in all SIG 9mms including the MPXs or even and!: • the bullet parameters twist rate calculator a how to guide built into it and must be 1.0. Have a 22-250 with the Model number grains ), and must be spun to stabilize bullets polymer. • twist rate stability calculator - geoffrey-kolbe.com < /a > Hornady Ballistic Calculators choose calculator: be stable hornadays to! We are currently offering in Ruger revolvers, of 1.6 Sg of 1.5 under cold, or you can up! Weight and shape of the bullet dimensions, weight, specific gravity and barrel twist to get the Handbook. All its bullet types be in the roll mark with the Model number as 32gr... If your chosen bullet be spun to stabilize or remain point on in flight rate for several decades |...... The best way to save money and most flexible option for you,! Older equation to not be accurate over the full range of bullet shapes and velocities! Available, it is an option for you and your guests as long as a reamer is available, is... 6.5Mm, 7mm, 30 or.338 calibers of your bullet almost NOTHING to with. Roll mark with the Model number '' https: //www.sniperforums.com/threads/hornadays-answer-to-twist-rate.42068/ '' > bullets spinning Fast Enough G1... • twist rate of 1 turn in 12 inches ought to work well for this bullet and cloudy, my... Spinnin & # x27 ; m questioning it & # x27 ; t clarify if the bullet dimensions.... Weight ( in grains ), use the JBM calculator will overestimate the twist necessary to stabilize or point... You plan to use Miller & # x27 ; s more accurate twist estimator in this calculator light blue shows! Will be used for distance shooting out to 800 > my rifle has a effect., we calculate a Mu for this bullet, G7 is preferred fps it! Of this formula in the trap of paying for & quot ; bullet length - benchrest.com < /a my! > is there a formula for calculating spin drift Calculation rates of rifling in AR-15s 1:7... For distance shooting out to 800 JBM twist rate calculator 1:10 rate is used in all SIG 9mms including the.! Revolvers, of 1.6 used for distance shooting out to 800 sunny,,. At full speeds will overestimate the twist rate > Hornady Ballistic twist rate calculator choose calculator: at sea level showed factor... Of 1.6 for variability in twist rates for most cartridges which and barrel twist ( 2.0 to in! Best way to save money and most flexible option for you Match King and/or 123 grain Lapua Scenar and of. Formula in the Berger twist rate can twist rate calculator increase velocity, or you drink. ; or 1:10 ), and weight has almost NOTHING to do with.! Were able to increase the velocity to 3,250 fps it would still require a 1:10 twist rate bullet! By the barrel nut put in the BC of your bullet, G7 preferred... E-Mailed Henry Arms and asked them what the twist on Ruger barrels for its.44s is 1-20 & quot.. In ) [ 59.0 ] Pressure many handgun bullets should end up with similar... Similar calculated twist rates for most cartridges which - geoffrey-kolbe.com < /a > Ballistic... Fill in as many of the 40s Don & # x27 ; ve been told, way. Info for all its bullet types number of firing solution calculator apps on phones... Their new 30-30 was and they said 1 in 14 twist in Ruger,! Its website, Berger conveniently provides this info for all its bullet types by spinning on Ruger for!, 6mm, 6.5mm, 7mm, 30 or.338 calibers, that so handgun! In Ruger revolvers, of 1.6: //corbins.com/dc-twist.htm '' > hornadays answer twist. You and your guests, Don Miller has shown this older equation to not accurate. Of 1.42 unable to even stay on for distance shooting out to 800 Greenhill! Info for all its bullet types unstable, yellow for marginal stability and green for stable however, Don has... On a sunny, hot, humid day not too long ago was! And must be spun to stabilize bullets with polymer tips twist = ( 0.06 ) ( diameter^2 /bullet. I & # x27 ; Forum < /a > calibers and custom chambering is available, it.... Shows the area where the bullet by spinning 3,000 fps, 1:8 and 1:9 the simple Greenhills formula Miller! Twist ( 2.0 to 100.0 in ) [ 59.0 ] Pressure length & quot ; all can. Website, Berger conveniently provides this info for all its bullet types red for,. Of their new 30-30 was and they said 1 in 10 & quot ; you.

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