Some of the thinner more frangible .224 are known to disintegrate at ultravelocitiesDAMN !! Just when I thought that I knew it all,I came up with something that I kinda knew,but not all the way. ( Please do not tell RidgeRunner or Joel that I 'fessed up to this).
It is the bullet stability in flight thing. NOW . . . most shooters,hunters,reloaders,do not need to worry about a bullet being spun fast enough to fly straight and true and not yaw or pitch on it's way to the paper or animal.
But some 5.56/223,308,243,260,6.8,6.5,and others need to tale a closer look if they choose to shoot a heavier/ longer than "normal" bullet.
The formula that I have been using is the MILLER STABILITY FACTOR. This,at JBM Calculations (Stability). Your inputs are easy,and redily available at most bullet manufacturer's web sites. You will need weight,and bullet OAL. Also velocity and if poly tip,the length . . however I have found that the latter does not make much difference. The biggie is bbl twist rate.
As stated before the twist rate is effin MUCH more important than fwd vel. I am quickly learning this with my 22-250 1:12 bbl. I wanted to use the 62-70gr bullets but no-can-do. Even though my vels will be much faster than a 223/5.56. Also the bullets design/make-up has a lot to do with it because the less lead,the longer for weight the bullet is.
The 1:10 twist of some of the newer guns would be great for the longer range things. And . . . with the heavier bullets comes the longer lengths with equates to a much better B.C.
Using the Miller formula,your looking for a number between 1.3 and 2.0. A little under 1.300 is marginal and most likely a number like 1.288 would be fine.
REMEMBER - - -> for bullet stability in flight,velocity is great . . BUT . . bbl twist rate is king. The prime example is with the 223/5.56,the 1:7 twist is king (IMHO). YOU CANNOT OVERSPIN A BULLET !!
》》》 Now that I know it all about this subject also,any questions,just ask. --- SAWMAN
If you shoot a rifle in 222 Remington or 223 Remington, this may be the ideal varmint bullet for you. This bullet is designed for the velocity levels typical of these two popular rifle cartridges to give maximum terminal performance. It can often give accuracy rivaling even our famous MatchKings. The sleek Sierra Spitzer point shape assures downrange performance. Designed for total frangibility upon impact, this lightly jacketed bullet should be used only in "conventional" twist rate barrels (1x12" or 1x14"). Use in fast twist rate barrels can result in bullet disintegration in mid-air!
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Years ago was reloading maybe hornady bullets in my 22-250 and there was that warning. I never exploded any bullets either. But, I guess that not all barrels relative to rifling engraving are the same here. I would be more concerned with some minor bulging that might impact grouping. But, it you have done it and all is good there is not much more to say.With due respect,the link that you posted (post # 53) is simply not true.
As stated above,a person would actually have to try hard to accomplish this. You would have to deliberately stray from all levels of common sense.
SHOW ME . . . I would love to see this. Look what the link is saying. A 222 or a 223 with a 1:11 twist will explode these bullets ?? --- SAWMAN
Some of the thinner more frangible .224 are known to disintegrate at ultravelocities
That is interesting. In military rounds like 30-06. 308, 5.56 and others that are fired in semi auto or even closed bolt machineguns one would expect to hear of more KaBooms. But I would not discount this out of hand. There are some seemingly unexplained kabooms with handloads. I could certainly see a hot chamber resulting in greater velocity. Cook offs normally do not blow up a gun, assuming that the barrel is not yet cherry red and lost its strength.Cartridge "cookoff" testing also confirmed that pre ignition temperatures caused a thermal decomposition reaction in the propellant which at its chemical limits "detonates". We know from other KaBooms the higher pressures caused by detonation as opposed to normal rear to front ignition. The thermal decomposition reaction could be growing but interrupted by a primer strike ignition and still cause much higher pressures and resulting muzzle velocity extremes