SchwarzStock wrote on Oct 11^th, 2013 at 5:06pm:


Not necessarily. My first question to you is what type of 55gr. bullets were you shooting?

A fast twist doesn't always hurt you like most people think. The problem that makes it's ugly head shown is when you use poor quality bullets or your loaded ammo has a lot of run out. The run out or poor quality bullets the faster twist will amplify the run out and that is what makes the groups worse. 

When I started shooting Hi Power rifle back in the late '80's almost no one was shooting a AR15 style rifle. I started with a NM M1 Garand. In 1990/91 I had my first match service rifle AR built. While that was being built I started to play with a rack grade colt AR15a2 with a factory 1-7 twist barrel. Back to that in a second. At that time there were no 75-80gr. bullets out there. The heaviest bullets out there where 68gr. Hornady, 69gr. Sierra and 70gr. VLD's by JLK. While my gun was being built I played with the rack colt AR15. I went to the range with a scope on it and some 69gr. handloads. No floated barrel and no custom trigger etc...those handloads would shoot right around 3/4" at a 100 yards. When I ran out of my handloads I loaded some factory 55gr. ball ammo to practice my off hand. On average 2 out of 5 rounds would go thru the target sideways at a 100 yards. I thought I wrecked something! After talking with my barrel maker at the time and my gun builder I went back to the range but this time with two different handloads. My 69gr. Sierra's, 52gr. Hornady Match bullets and some more of the factory 55gr. ball ammo. Started with the 69gr. bullets. Gun went back to shooting 3/4". Ran out of those then