01-01-2021, 03:36 PM
This is a 70 gr NBTV in a fired case. Its 1.71" base to comparator datum line to adjust my 1.68" for the TMK to ARC's lower shoulder and give a visualization of how much neck would be used in ARC. It doesn't quite give full neck usage, but it's close - and I'm guessing some of that boat tail ends up being more bearing surface on a flat based Varmageddon
Note that my neck is quite short. The brass is actually 6x39 and I trimmed it after sizing from 7.62x39 (which I shouldn't have). When I fireformed, the neck shrunk. That case is 1.485 and will size to 1.490, so a "normal" case will have 0.02" more neck on the tip side. It actually works fine for my purposes for this brass, which doesn't involve sub MOA accuracy.
Note that my neck is quite short. The brass is actually 6x39 and I trimmed it after sizing from 7.62x39 (which I shouldn't have). When I fireformed, the neck shrunk. That case is 1.485 and will size to 1.490, so a "normal" case will have 0.02" more neck on the tip side. It actually works fine for my purposes for this brass, which doesn't involve sub MOA accuracy.