Originally Posted By RedFalconBill:
Originally Posted By rcdice:
This question is specifically in reference to stabilizing various weights of bullets. Hence, this post in the Ammunition Forum.
Since a 1:9" twist barrel might not be able to stabilize a heavier bullet, say 70 gr and above in .223/5.56, why are they so common from the higher volume manufacturers? Most of the rifles that are currently coming out of Rock River, Stag, DPMS, Bushy, etc. are 1:9". Is it really more expensive to produce a 1:7" twist over a 1:9" twist barrel?
Why don't they all just standardize on 1:7" and be done with it? What is the advantage of 1:9"? There obviously must be one.
1/9" is there so people will not bitch when shooting 40gr Blitz, TNT, and SX, bullets. When they introduced the 1/9" twist barrels to the general public, the Cruiserweight and (65gr to 70gr) bullets were not around, except the 70gr Speer SP. It also does a really good job with the std. 55gr and 62gr ammo that most people fire.
A 1/9" twist does fine with the 68gr, 68gr, and most (not all) 70gr bullets. A 1/9" twist can also stabilize some (not all) 75gr and 77gr bullets.
Only here do people debate this. At your LGS, all people want is cheap ammo. Most duffers are not going to pony up for match ammo.
1/9" twist are what the manufacturers can get from the barrel makers at the price they are willing to pay.
If you want a barrel with a 1/7" twist, then buy one. Do not worry about what other people do or think, or even what the industry does, or does not.
But a 1/8 twist is pretty sweet.
Just don't let your decisions be pushed on you by folks who say things about 1/7 or 1/9.
Use what suits you and your ammo choices.