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TWIST RATE AND DO YOU HAVE IT CORRECT

Side note: Hornady has their 4d ballistics that can be downloaded and Bergers also(no download), but their bullet selection. Too keep the hyperbole down , any ballistic info welcome!
 
TEXASforLIFE said:
Side note: Hornady has their 4d ballistics that can be downloaded and Bergers also(no download), but their bullet selection. Too keep the hyperbole down , any ballistic info welcome!
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Speaking of ballistic calculators and such. You know what would be a good topic to follow this one? Actual twist rate on barrels. As well as what grain of bullet is stable with each twist rate and length of barrel. Some people don't know that certain twist rates are better for different grain bullets and barrel lengths. I used to have all this info, but can't find it.
 
RandomHero said:
Speaking of ballistic calculators and such. You know what would be a good topic to follow this one? Actual twist rate on barrels. As well as what grain of bullet is stable with each twist rate and length of barrel. Some people don't know that certain twist rates are better for different grain bullets and barrel lengths. I used to have all this info, but can't find it.
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It could be another thread, but it could avoid hyperbole? If you figure the heaviest bullet for your cartridge and calculate the twist then you should be fast enough for the lighter ones? This would be based on temp, altitude and the rest of the formula.
 
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.223 / 5.56 Only as you can see the bullet weight and twist right and barrel length are important in relation to how versatile your rifle will be with different twist rates as you can see a 1:8 Twist allows you to shoot 50, 55, 62, 75, 77 grain as you can see the heavier bullets shower bullets are better stabilized in the 1:7( Military Choice ) Twist & 1:8 Twist compared to 1:9 & 1:12 twist. While 62-grain bullets prefer a rate of twist around 1:8, 77-grain bullets weights favor a 1:7 twist rate. With AR-15 ammo, it is likely going to be the most common bullet weight, which is 55-grain (a 1:9 twist rate).

In. 308 / 7.62 Nato 1:8 . The numbers on the 175-grain MatchKing, which has a diameter ratio of 4.081 (1.257 inches divided by .308), look like this: T=150 x .308/4.081, which gives us an optimum twist rate of 1:11.32. 1:12 is the choice for 175-grain bullet weight for best stabilization. However, it is easier to hold a longer barrel from unsupported positions and hence may lead to a more accurate shooting. The typical barrel length for a hunting rifle chambered for high-intensity cartridges like the .308 is 22-24 inches. Fortunately, ..308-caliber rifles nearly all have twists faster than 1:10, so there is seldom a problem. However, the standard twist rate of the .308 Winchester is 1:12, so loading a longer bullet could put you close to the stability boundary.
 
TEXASforLIFE said:
Giving any facts this statement holds true, "Nothing will be exact, but being incorrect will be greater"! You can't account for everything, just what's in your face! Down range anything/everything can/could happen! This is not a debate on distance, just a statement on having the correct or close enough twist rate for the ammo choice! Take it face value and nothing more! This is off topic for your post. Try another, thanks!
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No, it's not that simple, It all plays an important role in the impact of that bullet on target or missing the target , reading the mirage for wind direction at or near the target, Temperature wind speed and direction bullet weight barrel length and twist rate, rotation of the earth, Location relation to the target, bullet speed FPS temperature of the cartridge case is it heated by the sun is it cold sitting in the snow? Bullets vapor trail Understanding all of this just makes you a better shot and more than likely to score a hit at extreme ranges. Just trying to help you pass on what I learned more than 49 years ago in Sniper School in the U.S. ARMY. Now we have cryo treating of steel barrel to make it harder and removes harmonics from the barrels improves accuracy. anything you can learn will give you an Edge. The stupid question is the one you never ask.
 
EL LOBO said:
No, it's not that simple, It all plays an important role in the impact of that bullet on target or missing the target , reading the mirage for wind direction at or near the target, Temperature wind speed and direction bullet weight barrel length and twist rate, rotation of the earth, Location relation to the target, bullet speed FPS temperature of the cartridge case is it heated by the sun is it cold sitting in the snow? Bullets vapor trail Understanding all of this just makes you a better shot and more than likely to score a hit at extreme ranges. Just trying to help you pass on what I learned more than 49 years ago in Sniper School in the U.S. ARMY. Now we have cryo treating of steel barrel to make it harder and removes harmonics from the barrels improves accuracy. anything you can learn will give you an Edge. The stupid question is the one you never ask.
Click to expand...
AND YET YOUR STILL ON THE WRONG SUBJECT/THREAD!
 
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