Why is it my 30 nosler cases never need to be trimmed? More to the point why are they so much shorter than the trim to length of 2.556"? They are mostly 2.536-2.542 it seems and been fired 3+times. Maybe not shooting it to potential and the cases just don't stretch? The chamber is pretty tight on this xbolt HCLR? New Nosler cases are 2.538. I have one case that has been fired that is right at 2.556 all the rest are at least 0.010"or more shorter.