.223 twist rate?

My 223s (4) non of which are used at ranges exceeding 300 yds., all shoot 40 to 60 gr. bullets very well and that is with both 1-12 and 1-14 twist.
Anything heavier than 60 doesn't stabilize with the exception of the 70 gr Speer and it is a short stubby bullet originally meant to use in the 22-250.
 
My understanding of the "overstabilized" problem is that at longer range the point of an overstabilized bullet will not follow the trajectory and so will shed velocity faster and lose accuracy at extended range.
So let's say you are shooting the .224 Barnes 40 grain Varmint Grenades which are .7" long and will definitely stabilize in the 1:12 and probably in a 1:14
So let's also say that you have the same gun but with a 1:7 twist barrel, using the same bullet, launched at the same muzzle velocity the trajectories should be nearly identical at moderate range, however as the range extends, the bullet from the 1:7 barrel will begin to drop faster and the group size will begin to expand in a non-linear fashion because the bullet will be traveling at a greater "angle-of-attack".
 
Pushed both 75 and 80gr Amax out to a mile with zero problems in a 7 twist. Others have used their Savage 9 twist to go 1 mile with the 75gr Amax.

Berger 80gr VLD weren't so happy but went 1400yds without issue.

Only thing I can suggest is point it at the horizon and pull the trigger. Best way to find out what will really work.

Jerry
 
Stabilization has Fook-all to do with weight and everything to do with lengthfor a given twist.

The dynamics of any barrel/cartridge combo are such that some bullets work and some don't. If you have 80 Bergers key-holing in a 1:8, you either have a longer-than-advertised twist or you are not driving them fast enough. Lousy groups don't necessarily mean they aren't "stabilizing"
 
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