.300 WM Loading Questions
So I loaded up some rounds in January, fired 'em and found a promising load. I did 5 rounds per charge and tried to make the cases per group as close to the same length as possible. Most were in the 2.620 which is the max length, but those that were 2.615 I'd group together, etc.
So after that range trip, I'm just now getting back to loading up two promising charges from that previous range trip. Not surprisingly my cases have exceeded max case length and are now 2.650 or so. No big deal, and I trim them all up. My trim gauge ends up trimming them all to anywhere between 2.614 and 2.616. They're actually more uniform than before. So my question is this, how important for accuracy is it that the case length of my promising load was 2.620 and now the case will be 2.614? I'm looking for sub MOA (or hopefully 1/2 MOA) accuracy but at 100 yards. I'm not a long range guy so will this case length difference be negligble? I got 3 shots in one hole and then pulled one in January, so I'm REALLY hoping this recipe is a winner.