Originally Posted by reynolds357
I have found that a rifle likes what it likes and have found no other correlation. I start with the bullet jammed into the rifling and back up from there. I have a 6.5 X 55 Swedish Mauser that will only shoot 140 Bergers if they are actually pushed deeper in the case by the rifling themselves. It shoots a ragged hole that way. If you back it off ANY, then it is 1.5 moa. The only negative is that once you press down the bolt, you have to shoot it or dump powder out of the rifle and knock the bullet out with a rod.
That seems common to long leade milsurp rifles. Almost all the milsurp bolt actions i have tinkered with preferred a good jam. Problem with some is the leade is so much theres barely any case on the bullet. My finn 39 comes to mind. Itll shoot ragged holes if i seat to the lands with a 174 SMK, but any less and it quickly spreads the groups out. So i seat em where the rifle wants em and put a fair crimp to keep the bullets still during loading and feeding.
I also had a British enfield #4 mk 1 .303 that wouldnt shoot unless the brass was necksized ONLY, and had at least .2" of jump. Dunno, what the deal was with that one. I must have wasted 1000 bullets and 3 pounds of powder trying to figure it out.