04-11-2021, 06:22 AM
(04-11-2021, 02:13 AM)StoneHendge Wrote: When I started on my 400 pieces, I bumped 5 back to SAAMI minimum of 1.183 base to B comparator line. Used them for my initial function check and then was able to use the fired measurement for sizing the rest. If you size all of them down to SAAMI minimum, you would possibly be subjecting your brass to unneeded stretch, but any virgin ARC brass would also be at SAAMI minimum (or below) - as would any brass in factory ammo. In my case, my Lilja chamber is 1.188 and I bump them to 1.185, so if I had bumped them all to 1.183, it wouldn't have had an impact on my brass life.
While you ponder that, fire up the trimmer! Your going to need to take 0.03" off and take them down to 1.480" OAL, and you should do this before you bump down since the longer Grendel brass could hit the top of your die. It did with my Hornady die and I lost a couple to dimples on the shoulder. The trimming is the vast majority of the work. You could/should do your chamfering/deburring too. After that it's just a quick lube on the shoulder and inside/outside of the neck and through the sizer.
I guess it is possible for the neck to hit the top of the die... but it doesn't. I sized a Hornady ARC case, checked it for measure, then sized a Hornady Grendel checked it for size. I got the exact same reading on both. I also checked my die and the neck was a good ways from topping out, hence removing the decapping pin I could see down there pretty well and used my bent paperclip for checking cases to feel around in there. I think I would have seen shoulder or neck damage if it was hitting. I think were ok resizing Grendel brass in a Hornady die. At least my die is ok. But I will try your method as I have done it to other brass I resized, but the Grendel case is barely being moved and trimmed very much.
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