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Bartholomew Roberts · September 29, 2013, 01:41 PM

I've actually run into problems with a 16" 1:9 Bushmaster HBAR stabilizing 75gr and 77gr ammo at 100yds. I was getting 4-5" groups with match ammo. No keyholing but really poor accuracy. At 200yds, I couldn't even keep them on the paper to figure out the group size.

However, I've watched a friend's 16" Armalite 1:9 shoot the same 75gr ammo into a 1" 5-shot group at 100yds.

For me, my general rule is if I know I want to shoot 75gr and up, then I buy a 1:8 or faster twist.

September 29, 2013, 01:41 PM	#16
Bartholomew Roberts member Join Date: June 12, 2000 Location: Texas and Oklahoma area Posts: 8,462	I've actually run into problems with a 16" 1:9 Bushmaster HBAR stabilizing 75gr and 77gr ammo at 100yds. I was getting 4-5" groups with match ammo. No keyholing but really poor accuracy. At 200yds, I couldn't even keep them on the paper to figure out the group size. However, I've watched a friend's 16" Armalite 1:9 shoot the same 75gr ammo into a 1" 5-shot group at 100yds. For me, my general rule is if I know I want to shoot 75gr and up, then I buy a 1:8 or faster twist.