Hi All, Not trying to stir up old threads....I've done massive research regarding reloading the 300 winmag, on this and other forums, and I can't find the answer to some specific questions. Just for some background: I am not new to reloading, but am fairly new to the belted mags; I am loading for use in a extreme long range target rifle (AX300); I will be using 195 grain Sierra TMK's; Using Norma brass. 1) Every reloading manual I have (quite a few!!!) shows the Max Case Length at 2.620, and the Trim To Length at 2.610...I have my trimmer set to 2.605 because there has not been one single virgin case that I've measured over 2.603! Once fired, they only expand out to about 2.608 max. Is this the norm for Norma brass, to be .007 short of Trim To right out of the box? 2) I totally get the whole "headspace" question with belted mags....that after the first fire forming, I am looking to headspace off the shoulder. My question has to do with bumping the shoulder back. My measurements show that after the first firing the case has stretched about .018, but then after the second firing it has stretched about another .003. So, do I bump the shoulder a couple thou after every firing, or just neck size until hard to chamber and then bump the shoulder. I've read a GazziliaMillion varying opinions on this....some even claiming one should FL size the case every firing (which I know is just wrong, but still believed by some). Sorry for the "windiness" of my questions, but thought background and specific numbers would help. Thanks all!!