How important is brass length on belted magnum cartridges? I understand the headspacing is controlled from the belt to the bolt face instead of the shoulder/rim so as long as COAL is consistent, I should be in the same position off the lands. Does brass length matter that much? (Assuming bolt closes with little effort and no extraction issues.) Just curious because I haven't been trimming my cases on my 300 WinMag reloads. I've been just neck resizing these and am expecting I have been bumping the shoulder back a bit, in the process, although I haven't measured for this. Not noticing any case stretch after 4/5 reloads?