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TN, USA
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Posted: 8/29/2017 9:37:26 PM EDT
I just finished a .308 on an 80% Genesis receiver assy with a 20" heavy fluted Faxon barrel. All good parts; Aero Precision BCG, Geissele trigger, MI hand guard, Little Bastard brake. I let a friend borrow it last weekend and he says it's a tack driver @ 100 yds shooting .5 -.6 moa with Hornady match ammo but when he went to 200 yds, he could hardly hit the target shooting at a 3 x 5 piece of paper. Went back to 100 yds...tack driver. Rifle functions 100%. Nothing loose, not the scope, nothing obvious. I've built a lot of rifles...lot of AR's, lot of precision bolt guns. Never had anything like this happen and it's got me and even some pro's stumped.
Has anyone had any experience with these barrels? I see Faxon isn't even offering it right now. Makes me wonder if they're just out of them or if there was a problem. TIA |
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Posted: 8/29/2017 9:49:52 PM EDT
[#1]
What is the barrel twist?
Does the ammunition box have a velocity? A combination of a short barrel and too little rifling twist is most likely the problem. Try shooting a shorter bullet. |
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Posted: 8/29/2017 9:55:31 PM EDT
[Last Edit: HighpowerRifleBrony]
[#2]
The internet says bullets go to sleep. These get woke.
Not enough magnification or wrong reticle for a 1.5x2.5 MOA target? ETA: Faxon shows 1:10 for .308 barrels on their site. Should be enough for up to Hornady's 208s. |
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TN, USA
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Posted: 8/29/2017 10:01:30 PM EDT
[Last Edit: steelcomp]
[#3]
Quote HistoryOriginally Posted By AeroE:
What is the barrel twist? Does the ammunition box have a velocity? A combination of a short barrel and too little rifling twist is most likely the problem. Try shooting a shorter bullet. |
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Posted: 8/30/2017 7:22:25 AM EDT
[#4]
Have you tried verifying your friend's results?
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Posted: 8/30/2017 8:43:25 AM EDT
[#5]
Quote HistoryOriginally Posted By rob78:
Have you tried verifying your friend's results? I would measure the barrel rifling twist, and shoot a shorter bullet, too. Maybe try a different lot of the ammunition from the first trial. |
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TN, USA
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Posted: 8/30/2017 9:49:55 AM EDT
[#6]
Quote HistoryOriginally Posted By rob78:
Have you tried verifying your friend's results? |
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Posted: 8/30/2017 1:25:58 PM EDT
[#7]
Originally Posted By steelcomp:
I just finished a .308 on an 80% Genesis receiver assy with a 20" heavy fluted Faxon barrel. All good parts; Aero Precision BCG, Geissele trigger, MI hand guard, Little Bastard brake. I let a friend borrow it last weekend and he says it's a tack driver @ 100 yds shooting .5 -.6 moa with Hornady match ammo but when he went to 200 yds, he could hardly hit the target shooting at a 3 x 5 piece of paper. Went back to 100 yds...tack driver. Rifle functions 100%. Nothing loose, not the scope, nothing obvious. I've built a lot of rifles...lot of AR's, lot of precision bolt guns. Never had anything like this happen and it's got me and even some pro's stumped. Has anyone had any experience with these barrels? I see Faxon isn't even offering it right now. Makes me wonder if they're just out of them or if there was a problem. TIA First, and to put fears to rest, no problems at all! We are just re-vamping them to the Match Series. The non Match Series sold out and rather than confuse everyone with having an out of stock item, we took it off the website. By the definition I am seeing, I would hazard to guess that parallax on that optic is to blame. Group variability is set once the bullet leaves the barrel and stabilizes - usually within 10-50 yards from the exit. Thus 1" at 100 would be 2" at 200 - assuming no wind, ideal conditions, etc. For there to be such massive variation, it is not likely the firearm, but the optic. I would swap it or ensure perfect technique when getting cheek weld as its parallax is extremely sensitive. |
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Posted: 8/31/2017 9:19:38 PM EDT
[#8]
Shoot at a larger target and see if it still holds the same grouping but just not hitting POA. If it's still grouping well it's probably as stated above and is an optic issue. Or try a different scope.
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DC, USA
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Posted: 9/14/2017 9:26:35 PM EDT
[#9]
Originally Posted By steelcomp:
I just finished a .308 on an 80% Genesis receiver assy with a 20" heavy fluted Faxon barrel. TIA I have gotta ask, and nothing to do with your post: When did you get the 80% Genesis lower? I know many of (us) have been emailing those guys, and think they are out of business. |
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