For comparing shoulder bump of 6.5 creedmoor cases before and after resizing. 30 degree shoulder w/ 0.310 neck diameter. I'm working on a new one for 6mm gt that i'll upload too. I suggest printing this one with the case contact surface "up" so that the supports don't create a rough surface on the measurement surfaces. The hole is for a heat-set insert, part number 97163A134 from mcmaster carr. Any 1/4-20 bolt works. I wanted to use a larger bolt so that I could hand tighten.

Print at 15% infill minimum. I did .15mm layer height with PLA, supports everywhere.