Originally Posted by
jim_k
Just my experience, but I had new brass in a .300 Win Mag that I traded in, so I no longer have it. Fired new factory ammo, but can't remember the brand. Sized it based on headspace as noted by poster above, and fired a couple of times in my rifle. No used brass, and no other rifle. Then I could not chamber it, and almost got a live round stuck in the chamber (no bueno). Checked the brass with the gauge on the Larry Willis die, and it was too wide. Ran it through the die, and no problem after that. YMMV.
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