You could be on the edge of the powder charge node and the seating depth change threw it off enough. I've only shot the 7mm version of the match burners and they were very forgiving in seating depth much like the old Sierra mk design.Got some Barnes match bullets for my 6.5 creedmoor, 140 grain BTHP, and I went today to check some different seating depths. Started about.020 off the lands and worked all the way to .045. The first 4 groups (.020, .025, .030, & .035) all shot decent groups close to point of aim. When I got to .040 the groups shifted almost an inch from point of aim. The groups opened a bit too, but I’ve never seen an impact shift like that, especially from only a 5 thousandths difference, from .035 to .040. Brass from all the groups looked about the same, so I don’t think there were any pressure spikes, besides I’ve always heard the closer you get to jam, the more you have to worry about pressure, not the other way.
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Shot some Staball 6.5 behind 130 gr ELDM’s in my 6.5 CM for accuracy. Found a couple nodes I believe. Now to chrono.
chrono some 147 ELDM 6.5 CM with super performance powder. Number’s weren’t great on the chrono but very accurate.
Ahhh. Done.
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Have him check to see if the BCG is assembled correctly. If the bolt is 180 out it will not eject....Yesterday, I made some dummy .223 rounds for a friend. Used de-primed brass, no charge, only bullet.
I made 10 and colored them blue with a Sharpie. So that he can easily tell they are dummy rounds. Or he could just buy snap caps. LOL But I didn't want him to have to wait for them to arrive in a week or two.
Reason I made these for him is that he built an AR from a kit and tried to load live ammunition and it would not seat or eject. I really do not want him feeding live ammunition into a gun that has never been tested, in his house, in a neighborhood. I consider that highly unsafe. Waiting to hear back on how the dummy rounds cycle.