Needing advise on a barrel.

SerpentSix · November 21, 2002, 14:15

I am getting ready to purchase a Barnett barrel for my M1 chambered for 308. My question is whether to get the 4 groove or the 6 groove rifling. I know it's not an FAL but you guys are smarter than most. I feel sure some of you have run into the same situation or heard of others who have. Thanks in advance for your help.

HD99FXR3 · November 21, 2002, 23:15

what the hell, go with six. more is better right? just kidding. in my opinion 6 is better. you might lose on the velocity but it should stablize the bullit better.

**Hebrew Battle Rifle** · November 22, 2002, 00:02

The twist rate will be a greater factor in the accuracy than the number of lands and grooves. In general, a 1:10 twist rate will provide better results with the bullets in the 147 grain to 180 grain weight range ( in 308win).

1:10 twist rate means that for every 10 inches of forward travel, the bullet will make 1 revolution.

Blag · November 22, 2002, 06:20

Split the difference and go with 5 grooves. Well, make it 5 and 1/2 grooves. No, wait, 4 and 2/3!

If you're going to use the heavier (and longer) bullets, of 173 grain and higher, go with 4 groove / 10 twist.

Krieger uses 4 grooves for their M1A & Garand barrels, and they have a strong reputation.

Dan Lilja has used a 3 groove barrel in competition, and others have as well, with good results, and Lilja now sells them. This is a special 3 groove, with extra wide lands - like a 6 groove but omitting every other groove. Lilja wanted more land surface at the throat to resist gas erosion, but it turned out the barrel shot well, too.

A barrel with fewer grooves is easier to clean because of less surface area to foul. For soft lead bullets you might want more grooves for more grip, but 4 should be plenty for regular jacketed ammo.

4 groove, yea.

November 21, 2002, 14:15	#1
SerpentSix Registered FALaholic #: 7839 Join Date: Oct 2002 Posts: 4	Needing advise on a barrel. I am getting ready to purchase a Barnett barrel for my M1 chambered for 308. My question is whether to get the 4 groove or the 6 groove rifling. I know it's not an FAL but you guys are smarter than most. I feel sure some of you have run into the same situation or heard of others who have. Thanks in advance for your help.

November 22, 2002, 00:02	#3
Hebrew Battle Rifle Horses Ass Bronze Contributor FALaholic #: 5777 Join Date: Mar 2002 Location: Arkansas Posts: 6,812	The twist rate will be a greater factor in the accuracy than the number of lands and grooves. In general, a 1:10 twist rate will provide better results with the bullets in the 147 grain to 180 grain weight range ( in 308win). 1:10 twist rate means that for every 10 inches of forward travel, the bullet will make 1 revolution. __________________ THANK YOU JESUS

November 22, 2002, 06:20	#4
Blag Registered FALaholic #: 1148 Join Date: Sep 2000 Location: Oklahoma Posts: 1,527	Re: Needing advise on a barrel. Split the difference and go with 5 grooves. Well, make it 5 and 1/2 grooves. No, wait, 4 and 2/3! If you're going to use the heavier (and longer) bullets, of 173 grain and higher, go with 4 groove / 10 twist. Krieger uses 4 grooves for their M1A & Garand barrels, and they have a strong reputation. Dan Lilja has used a 3 groove barrel in competition, and others have as well, with good results, and Lilja now sells them. This is a special 3 groove, with extra wide lands - like a 6 groove but omitting every other groove. Lilja wanted more land surface at the throat to resist gas erosion, but it turned out the barrel shot well, too. A barrel with fewer grooves is easier to clean because of less surface area to foul. For soft lead bullets you might want more grooves for more grip, but 4 should be plenty for regular jacketed ammo. 4 groove, yea.

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November 21, 2002, 23:15	#2
HD99FXR3 Registered FALaholic #: 5260 Join Date: Jan 2002 Posts: 1,245	what the hell, go with six. more is better right? just kidding. in my opinion 6 is better. you might lose on the velocity but it should stablize the bullit better.