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Joined: Feb 2005
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Campfire Tracker
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OP
Campfire Tracker
Joined: Feb 2005
Posts: 3,241 |
Getting ready to order my barrel and I have a choice between 1x8.5 and 1x11. I want to shoot subs and supers and want the better twist for both.
-Piss into the wind.
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Joined: Jan 2010
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Campfire Regular
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Campfire Regular
Joined: Jan 2010
Posts: 2,621 |
There's not really a good twist for both. I would go with a 1-11" or 1-10" and see how the subs do with those twist. Of course, develop the sub loads without a suppressor to make sure they are stable. An 8.5 twist is really just too fast for standard velocity ammo with a .308.
Last edited by wareagle700; 02/03/15.
John 8:12 "I am the light of the world. Whoever follows me will never walk in darkness, but will have the light of life."
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Joined: Jan 2005
Posts: 57,494
Campfire Kahuna
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Campfire Kahuna
Joined: Jan 2005
Posts: 57,494 |
Would have to lean to the 8.5, running 7 in my 300/221.
You may not get to top speeds with supers, that being said, I ran 6.5 twist in 223, and was easily able to hammer out 52s at max speeds, which I was told would never happen.
Worst case with 8.5s as noted, you'd have to run the supers a bit slower than normal.
I'd be careful about 8.5 stabilizing subs though...
We can keep Larry Root and all his idiotic blabber and user names on here, but we can't get Ralph back..... Whiskey Tango Foxtrot, over....
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Joined: Jan 2006
Posts: 720
Campfire Regular
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Campfire Regular
Joined: Jan 2006
Posts: 720 |
I just order a 308 barrel for a AR 10 that I'm building I went with 1 in 11". The 8.5 is too shoot heavy bullets at subsonic speeds. BHA told they were having some issue with the 8.5 twist.
I hope this help
Code Pink sucks
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Joined: Dec 2002
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Campfire Ranger
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Campfire Ranger
Joined: Dec 2002
Posts: 22,274 |
1 in 8" works for 220 Matchkings, subsonic in a .300 BO. I have some 240's and will experiment with them as well.
My AR-10's are both 1 in 10"
"...the designer of the .270 Ingwe cartridge!..."
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Joined: Dec 2002
Posts: 1,981
Campfire Regular
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Campfire Regular
Joined: Dec 2002
Posts: 1,981 |
BHW told me the 8.5 was good to go a couple months ago and the one I bought appears to shoot very well. I haven't had time to work with it much but the 40 or so supers that I have run thru it appears to be shoot excellently.
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Joined: Nov 2003
Posts: 18,346 Likes: 1
Campfire Ranger
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Campfire Ranger
Joined: Nov 2003
Posts: 18,346 Likes: 1 |
I think 1-11 would be too slow for the subs.
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Joined: Jan 2010
Posts: 2,621
Campfire Regular
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Campfire Regular
Joined: Jan 2010
Posts: 2,621 |
KSMITH,
If you want a gun to primarily shoot subs, get a .300 BLK on a AR-15 receiver. The .308 AR platform isn't the best choice for shooting subs and supers due to the limits of magazine length, the difference in twist rates, and the fact that they rely on gas to cycle the bolt.
If you just want to shoot subs every once in a while but will primarily shoot supers through it, go with a 11" or 10" twist in the .308 AR platform.
John 8:12 "I am the light of the world. Whoever follows me will never walk in darkness, but will have the light of life."
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Joined: Jan 2010
Posts: 2,621
Campfire Regular
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Campfire Regular
Joined: Jan 2010
Posts: 2,621 |
I think 1-11 would be too slow for the subs. Not necessarily. My Sako TRG owners manual states specifically that the 11" twist will stabalize subsonic rounds. I have never done it myself, but I will take Sako's word for it.
John 8:12 "I am the light of the world. Whoever follows me will never walk in darkness, but will have the light of life."
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Joined: Jan 2005
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Campfire Kahuna
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Campfire Kahuna
Joined: Jan 2005
Posts: 57,494 |
length of a 194 Lehigh and its speed at 1000 fps, will not stabilize in an 11, the makers even claim 8 may not work... I know 7 does...
We can keep Larry Root and all his idiotic blabber and user names on here, but we can't get Ralph back..... Whiskey Tango Foxtrot, over....
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Joined: Aug 2007
Posts: 19,496
Campfire Ranger
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Campfire Ranger
Joined: Aug 2007
Posts: 19,496 |
I'm curious as to what cartridge you're asking about. 300 BO, 7.62x51/308 Win, or something else?
Retired cat herder.
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Joined: Dec 2002
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Campfire Regular
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Campfire Regular
Joined: Dec 2002
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I'm curious as to what cartridge you're asking about. 300 BO, 7.62x51/308 Win, or something else? .308 WIN
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