Re: hornady headspace gauge sizing question, 30-378 .420?
Thanks for the reply. Since I could not find anything larger than the .420 gauge, I went ahead and gave it a shot. Since I had some interesting findings, I thought I would share my results:
Using the .420 gauge on my 30-378, I found .003-.004" of variance in the shoulder length (using RCBS dies). Comparing this to my 280 AI (redding dies), I'm seeing ~.0015" of variance in the shoulder length after sizing.
I am not sure whether this is coming from measurement errors or actual shoulder sizing errors. Either way, with so much variance in shoulder length on the 30-378, it makes it rather difficult to bump each piece of brass back 0.001". Basically, what I ended up doing was adjusting the die to bump each piece of brass (large batches) back bit by bit until the bolt would close easily on each piece.
If anyone has some mentoring advice or recommendations, please feel free to share. Thanks.