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Old 01-17-2016, 03:08 PM   #1
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 Terry G's Avatar
 
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The Colt AR-15's

I'm kind of moving this because it more likely fits in this Forum. My Colt SP-1 rifle and carbine are 1/ 12 right hand twist while my LE 6920 is 1/7. From what I gather the 6920 will handle the 62 grain bullets and up without problem, while the SP-1's will not. I did try some military green tip 62 grain the rifle and got key holes like mad at 100 yards. I'm going to stick to 55 Grain for everything, I think.
 
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Old 01-18-2016, 02:56 AM   #2
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Sounds like a good idea to me.
 
Old 01-18-2016, 10:15 AM   #3
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I'm running a 2000 manufactured Armalite M15A2 with a 14.5" barrel (RH 1:9") and I've used a number of different manufacturers ammo, from Swiss 62 grain match ammo to cheap 55 grain out of China. Between the both of them I've only noticed the group I gotten has only widened 1" from the expensive stuff to the cheap stuff.
 
 
Old 01-19-2016, 09:17 AM   #4
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I'd sell the old one to somebody who doesn't know any better, if it was me, :-) I'm not thrilled about the 1 in 7, either, cause it is close to overspinning the 55 and it's marginal with the .22 unit. 22's should be 1 in 16" twist, 1 in 9 is still ok, but I dunno about 1 in 7. if shtf, I'd not want to be unable to shoot the military''s ammo.
 
Old 01-19-2016, 01:28 PM   #5
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Quote:
Originally Posted by nikto View Post
I'd sell the old one to somebody who doesn't know any better, if it was me, :-) I'm not thrilled about the 1 in 7, either, cause it is close to overspinning the 55 and it's marginal with the .22 unit. 22's should be 1 in 16" twist, 1 in 9 is still ok, but I dunno about 1 in 7. if shtf, I'd not want to be unable to shoot the military''s ammo.
I'm not selling either Colt SP-1's.
 
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