Re: New caliber ??????
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: BobinNC</div><div class="ubbcode-body">If it is a new rifle, I buy 1 or 2 boxes of factory, and fire it, for control/baseline sizingBob</div></div>
ditto, that is, factory ammo that's shooting accurately through the rifle first. trim length, FPS, possibly identifying the powder make and get the charge, oal, etc.
then tweak here and there until satisfied.
i'm a cheap bastard, and once fired .308 is somewhat easy to come by, i keep my eye out for the new stuff being shot at the range, then pick it up off the ground.