I have found that cutting the crimp vs swagging it makes the primers stay tight longer. This is really important in my 300 BO super set up.
That's what I'll do then. I may look into getting a 60 degree chamfer bit rather than my current 82 degree - I think that the flatter angle would be better for cutting out just the crimp without going too far into the primer pocket, but reading around online, there seem to be plenty of old timers using a plain old 82 degree countersink.I have found that cutting the crimp vs swagging it makes the primers stay tight longer. This is really important in my 300 BO super set up.
That's what I'll do then. I may look into getting a 60 degree chamfer bit rather than my current 82 degree - I think that the flatter angle would be better for cutting out just the crimp without going too far into the primer pocket, but reading around online, there seem to be plenty of old timers using a plain old 82 degree countersink.
My approach with it is that less is more - I BARELY wind up with a chamfer at all when I do it - I see guys demonstrating it online who are IMO cutting way too deep. The crimp barely extends past the edge of the primer cup wall, so to my way of thinking, just a touch on the bit cuts enough off to get the job done.
I use the standard RCBS chamfer tool and only touch and remove with the tool spinning in my lathe chuck. It doesn't take much to remove the crimp.
7 seconds!? I'm literally just pressing the base of the case onto the countersink cutter for a mere moment and I'm left with a very nice but small chamfer on the edge of the primer pocket. I can't imagine that this isn't enough - the crimp is only on the edge of the primer pocket.I tried reaming crimped primer pockets with limited success on a forster chamfer tool.
Chucked on a drill press, I have to chamfer it for 7 seconds to get the crimp out. Even then, primer pocket is a bit too tight to hand prime comfortably, but works when I bench prime.
Maybe I'm just doing it wrong, but I stick with swaging for mass decrimp operations and reaming for occasional decrimp operations.
It could be my rcbs handpriming tool not centering the primer to the pocket.7 seconds!? I'm literally just pressing the base of the case onto the countersink cutter for a mere moment and I'm left with a very nice but small chamfer on the edge of the primer pocket. I can't imagine that this isn't enough - the crimp is only on the edge of the primer pocket.
It could be my rcbs handpriming tool not centering the primer to the pocket. Squished a few primers this way...
I got a bit of 300 blk cases that need to be decrimped. Will try just putting a small chamfer in and priming it on the bench.
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I am in new Windsor area. If you have some wood needs let me know. I can probably scrounge up some would for you.
Guzma
What gas checks are you using?
When I try to put 30 cal gas checks on my Lee 311-160 bullets already powder coated, they too often either don't go on straight or don't slip on all the way. (I measured bullet OAL after sizing).
I was advised to slip on GC BEFORE powder coating and that has been working for 30 cal gas checks.
Some will fall off when swishing but with the powder I'm using I dont have to swish much and I can quaranteen the ones that fall off and fix.