I use both (not mixed). I also suspect that Olin brass mills most of the strip brass used in ctg manufacturing in this country.
Do yourself a BIG favor and get the Lee collet necksizer die. Besides loading the most accurate .300 WM loads I've ever seen, your case life will be extended 3-5 times! No lubing either.
I was never a big fan of Lee equipment, but I tried that die after seeing some groups that others were getting with them, amazing!
I never got good results in the 300 with a FL zizer die.
FWIW
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