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2nd firing, 1st firing it was Factory Nosler 140 accubondHow many times fired on the brass?
Any extraction problems?
Were all the cases showing this?
I was thinking the same thing about the primers "the primers aren't all that flat" but then the ejector mark started showing up -barely visible at 50 grains, slightly visible at 51, and clear and shiny at 52 grains of powder. So I thought maybe on this 280AI the primers aren't going to flatten as pressure builds (like they do on my STW for instance where they can get totally smashed before I see other signs and need to back off). Maybe that shiny ejector mark doesn't mean very much in terms of whether it is reaching an over-pressure or not, I really am not sure.Not seeing much to worry about, unless you're having trouble lifting the bolt on extraction. Primers still appear to be rounded on the edges.
Thanks, that makes sense.Read the brass more than primers. I do a combo of everything. If I start getting flat primers I say stop, if brass shows I call it and stop. If bolt lift gets heavy I stop. That way your always safe. Thanks not thing I don't look at is cratering because some firing pins leave them anyway.
Action only allows 3.33 OALength and so does the magazine. 3.33 is the spec length for the 280AI but this chamber is longer. I've been seating at 3.33 so it's way off the lands about .040 (measuring from a black-marker dummy bullet set to touching the lands).Check your speed.
If you're uncertain about a given charge you can always load one case several times until your primer pocket gives out. I would probably back off if I couldn't get 6-8 firings before it loosens up.
Have you adjusted the die for your chamber? Or are you neck sizing?
I'm sorry, I was referring to your sizing die.Action only allows 3.33 OALength and so does the magazine. 3.33 is the spec length for the 280AI but this chamber is longer. I've been seating at 3.33 so it's way off the lands about .040 (measuring from a black-marker dummy bullet set to touching the lands).