Ok, so Ive been still wrestling over why the rifle is sizing my brass. fire formed brass measures form head to shoulder, (using hornady comparitor D-400) 1.626" I had previosly been setting the shoulder back to 1.624" and noticed that when cycled through the chamber it was setting it back to 1.619". So my thought was to just set them all to 1.619" and maybe cure the problem with the chamber sizing the brass. But then when I ran this brass through, again it had been sized to 1.616". Is this normal and somthing I should not be concerned with? Would it be stupid to think that the buffer spring in this rifle being to stiff is causing the bolt to slam shut so hard that it is causing both my problems, the brass to be resized and also the reason that the bullets will not stay in place with out a crimp? I have tried the neck tension only, sizing the necks to (ID) .334" and also .333" this still will not hold the bullets. Thanks for the help.