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Barrel question

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Old 10-20-2011, 11:16 AM
Junior Member
Join Date: Mar 2011
Posts: 19
Barrel question

I'm looking @ going with a JP-15 in .223. Their website states that the rifles come with a 1:8 twist barrel which they claim is an all around good twist for most any round.
I'd like to shoot 55 gr ammo, and this seems to be a fast twist for 55's.
Anyone shooting an AR with a 20" 1:8 barrel with 55 gr rounds that stack well?
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Old 10-21-2011, 08:36 AM
Silver Member
Join Date: Apr 2005
Location: colorado
Posts: 110
Re: Barrel question

I shoot the 55 VAMX out of a Lilja 8 twist and they shoot 1/2 to 1/3 MOA.
AR-10T in .308 & .243 both 24"
700 LA 7 WSM 30" 5R
AR-15 Rock River lower, WOA 26" varmint upper
Savage/ Broughton 23" .308
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Old 10-21-2011, 08:53 AM
Platinum Member
Join Date: Feb 2009
Location: Sedalia, MO
Posts: 1,253
Re: Barrel question

A 1x8" is fast enough to shoot 77s, 80s and 82s, no problem at all. It's a lot faster than you need for 55s. Thing is, there's really no such thing a "overstabilzation." A bullet is either stable, or it isn't. In this combination, the lighter bullets will have a much higher stability factor, but if they're good bullets, they should still shoot quite well. The one issue with a faster than needed twist is bullets of very poor quality. The excess twist will accentuate any jacket concentricity problems or center of gravity flaws in those bullets and that will open up the groups. The solution there is not to use crappy bullets, plain as that.
Kevin Thomas
Lapua USA
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Old 10-21-2011, 02:45 PM
Silver Member
Join Date: Jul 2007
Location: SW Wisconsin
Posts: 222
Re: Barrel question

As stated already, normally the 1-7 to 1-9 twist barrels will shoot the lighter bullets very well. I wouldn't hesitate to use 1-8 on 50-55gr bullets. No problem shooting 1/2 MOA or better with the lighter pills in a good barrel.
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Old 10-21-2011, 03:39 PM
Junior Member
Join Date: Mar 2011
Posts: 19
Re: Barrel question

Thanks for the replies gentlemen. Ya'll have been most helpful.
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