7 PRC Resizing

JM151

Lil-Rokslider
Joined
May 11, 2021
Messages
112
I went to the range first thing this morning only to chamber a round and not fit. Ok cool tried 5 more and not even close to fitting. Ended up packing up and driving a hour back home.

I’m confused what’s going on here. I was sure my headspace was correct by doing the feel method. I have a BAT vesper action and removed the firing assembly and ejector from bolt. Came up with 1.897 would not fit. 1.8965 had some minor resistance and 1.896 was better. My .002 bump was determined to be 1.894.

Had loaded 20 rounds to test of 1x fired brass and shoulder bumped to 1.894. None would fit. Got back home and tried to bump them back to 1.892 still would not fit. I tried multiple out of this batch and none would fit. I stopped here.

I basically have 2 boxes from ADG that I have kept separate, both being 1x fired. From the other box I have resized all pieces with a goal of 1.894 and loaded up and shot 25 last week. I still have 25 of this box that is sized but shoulder bump ranges from 1.896 to 1.892 as I was trying to dial in my sizing die. To verify I don’t have an issue with my sizing die, i took the two that measured 1.896 and just seated a bullet in them. They both fit. Ok so now I wanted to test if something was going on with my sizing die. I took the remaining pieces and ran them through the sizing die and got them all to 1.894. Seated a bullet in a few and they all fit. This confirms I don’t have an issue with my sizing die. I take the other box and run them through die again to go from 1.894 to 1.892 and they will not fit in chamber.

I have eliminated any issues with sizing die and seating die. The only difference is two different boxes but they have the same lot number. What is going on? I’m tempted to throw away the box I can’t get to fit.
 
I took multiple measurements between ones that fit and don’t…..and they are the same.
 
Your cases that don’t fit probably are not the same size as the ones that do, somewhere. Measure every aspect of one of each and find out where they are different. Neck diameter, loaded and unloaded (dummy rounds), body diameter, and base diameter, and full length of the case. Put the bullet comparator on the two dummy rounds, one from each box, and confirm the CBTO matches. Cover the one that does not fit in black sharpie and try and load it. See where the points of contact are. If you have a case gauge, plunk one of each in there and see if they are both showing the same length.
 
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