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I'm curious about the ring near the meplat and the blunted meplat, causes me the question the seating stem. How is the nk tension? I'm using the same seater and haven't had any issues.
Project turned into 3 BBs and two other Bartleins. Just a note on threading and chambering: zero noticeable difference between BBs and the others. They cut like butter. A few pics of the project:
The pics are not detailed enough for anyone to know for sure. Based on what I see, you have nothing to worry about, especially given (1)"once fired" lapua and (2)every piece shows the same stretch marks. The brass must stretch and that is exactly where one would expect, hence discoloration. If...
My experience with Hornday 300wm brass is the pockets usually go first, so I agree with txtaxman's suggestion on resizing. Getting it sorted before Lapua arrives is a good idea
HS is the distance of bolt face to brass base; hornady OAL gauge is not designed to measure HS. The problem was not your explanation. You checked with go/no go and all was copacetic yet, .004 b/w go and nogo is a surprisingly tight tolerance. Given some of the confusion, can you describe how you...
If you would rather not disassemble the bolt, insert a cleaning rod, from the muzzle, and seat brass by hand. Tap out with rod and post a pic of the witness mark.
Going in and out of battery will rotate brass, but the witness mark, from the pic, is linear. Burr would not leave that particular single straight line. Remove the ejector spring and close the bolt on a piece of brass, who thinks the witness mark will go away? The ejector spring is pushing the...
Hardness of primers vary, nothing looks dangerous in the primer pics. If there are no any other pressure signs, then keep shooting. "Scratch" is likely extraction mark, again nothing to worry about. Shoot it