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Post by multigunning on Apr 5, 2016 16:57:36 GMT -8
I am having the same exact issues with a 6.5 creedmoor as selectw is having with his 6mm creedmoor. I am running the new Berger AR hybrid bullet in 130gn weight. I am getting chambering issues with my mags, the cases are hard to extract with the charge handle, I'm getting scratch lines in the bullet, and in the brass. Any ideas of which way to go with this? The upper and lower are Grizz Precision (DPMS pattern). I have modified a steel magazine with about a 60% increase in reliability in the feeding. Let me know.
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Post by GLSHOOTER on Apr 6, 2016 13:04:30 GMT -8
I am having the same exact issues with a 6.5 creedmoor as selectw is having with his 6mm creedmoor. I am running the new Berger AR hybrid bullet in 130gn weight. I am getting chambering issues with my mags, the cases are hard to extract with the charge handle, I'm getting scratch lines in the bullet, and in the brass. Any ideas of which way to go with this? The upper and lower are Grizz Precision (DPMS pattern). I have modified a steel magazine with about a 60% increase in reliability in the feeding. Let me know. Handloads? Greg |
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Post by multigunning on Apr 6, 2016 13:34:05 GMT -8
Yes sir, Berger AR Hybrids 130gn, with 39.2gn varget, rem 9.5 primer, and hornady brass. We noticed this morning every piece of brass the gun has extracted has had marks on the necks. I inspected the lugs with my orthopedic scope and found a ton of burrs on the lugs. We have been having eject and feed issues with it.
The gun also has an SLR adjustable gas block, AR10 buffer spring, and AR10 308 carbine buffer. The screw on the SLR block is adjusted out two clicks from fully closed. If I go to 3 clicks, it acts like it is way over gassed and slings brass 4ft out the of the front of the gun in front of me.
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Post by GLSHOOTER on Apr 6, 2016 13:45:13 GMT -8
Yes sir, Berger AR Hybrids 130gn, with 39.2gn varget, rem 9.5 primer, and hornady brass. We noticed this morning every piece of brass the gun has extracted has had marks on the necks. I inspected the lugs with my orthopedic scope and found a ton of burrs on the lugs. We have been having eject and feed issues with it. The gun also has an SLR adjustable gas block, AR10 buffer spring, and AR10 308 carbine buffer. The screw on the SLR block is adjusted out two clicks from fully closed. If I go to 3 clicks, it acts like it is way over gassed and slings brass 4ft out the of the front of the gun in front of me. Bump the shoulders another 0.002. Go in and smooth the BACK edges of the lugs. Not an unusual issue. You are running a CARBINE buffer in a standard buffer tube? If so you need to put the standard buffer in it. You don't have enough weight to slow it down with the carbine. Greg BTW you are 1.0 grain over max in the Hornady book. Who's load data did you use? |
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Post by multigunning on Apr 6, 2016 16:32:59 GMT -8
The brass was brand new from hornady and I already pushed the shoulder back another .001" from how it showed up. Are you saying go to .002" total pushed back, or .003" total? This gun also would not feed factory Winchester BTHP 140gn Match ammo. It is a .308 buffer spring, and a .308 carbine buffer in a carbine length tube. This is the guy who I got the load info from: optimalchargeweight.embarqspace.com/This load I am shooting has no pressure signs at all. When I shoot factory Hornady ELD 140gn loads they have flat primers and show huge signs of pressure. These reloads on the 130gn bergers are moving at 2,762fps. The factory 140gn ELD out of my gun shoot at about 2,650fps, and the Factory Winchester BTHP 140gn fly at 2,680 fps. I tested another node at 38.2gn of varget, but when I was batch testing the gun still would not function those rounds. I tested from 38gn to 29.6gn of varget. |
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Post by GLSHOOTER on Apr 6, 2016 16:57:14 GMT -8
I'll have Ritch join in. I didn't see any 6.5 Creed loads on his lists. The chances are his loads won't be optimal for yours as the chambers and barrels are totally different in most cases when it comes to free bore and even rifling type.
Did you happen to measure shoulder height in some of those factory loads?
Greg
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Post by multigunning on Apr 26, 2016 21:03:12 GMT -8
Yes, I pushed them back further and I'm having grouping issues still. I talked to a guy and ended up putting some feed ramps in the breach face and got it feeding. When I shoot groups I get these weird flyers that I can't figure out. My sized brass comes in at 875" and my fired brass is at 925"
I'm starting to think my chamber is cut too small. Once my brass is fired, it fits in the Saami case gauge still and wiggles around.
Anyone got ideas? I am gonna shoot some neck turned brass next week. If the groups tighten up then it tells me the chamber is the issue for my accuracy.
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Post by GLSHOOTER on Apr 27, 2016 11:06:27 GMT -8
Yes, I pushed them back further and I'm having grouping issues still. I talked to a guy and ended up putting some feed ramps in the breach face and got it feeding. When I shoot groups I get these weird flyers that I can't figure out. My sized brass comes in at 875" and my fired brass is at 925" I'm starting to think my chamber is cut too small. Once my brass is fired, it fits in the Saami case gauge still and wiggles around. Anyone got ideas? I am gonna shoot some neck turned brass next week. If the groups tighten up then it tells me the chamber is the issue for my accuracy. Flyers are usually related to inconsistent lock up of the bolt and BE. This could be due to an out of square mounting of the upper to the BE or a bolt lug height inconsistency among other things. Barrels don'r routinely just chuck one. At times a variation in neck tension will also cause one to head off to Never neverland. I don't understand what you are measuring. I find nothing on the 6.5 CREED print that reflects back to 0.925 or 0.875 for that matter. What dies are you using? Apparently it is accepting your sized cases. I'm sure it is on the small side as this will normally help accuracy and velocity. As long as it is feeding it doesn't matter. The last thing you want to do is hog it out. Brass will routinely shrink after being fired so if you are right at minimum you may well be able to slide it into the case gauge. I've seen this on other chambers over the years. It makes for longer case life in many instances. Greg |
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Post by multigunning on Apr 29, 2016 11:51:43 GMT -8
There something wrong with the chamber in this barrel, the upper is on its way back to blackhole to be looked at. I was referring to outer neck diameter on the brass. The chamber spec from Pacific tool and gauge calls for the chamber neck to be reamed at .296" and the fired brass is coming out at .2925"
I have a feeling the brass is someone being crimped and not releasing the bullet correctly because the neck area of the chamber isn't the right size.
I have two other creedmoores I measured the fired brass on and they are coming out at .296"
This issue is happening with Factory Hornady and Winchester Match ammo as well.
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Post by multigunning on May 4, 2016 8:30:45 GMT -8
Black Hole called yesterday and is making me a new barrel. Could not be happier with the customer service of this fantastic company.
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