I am trying to find any information on loading 300 winmag with alint 400-mr powder pushing 208 gr a-max does anyone have any info or were to start THANKS FOR THE HELPgun)
Check out Alliant's web page (Alliant Powder - Home). It doesn't have the 208gn A-Max but does have a couple of loads for the 200gn class of bullet. This should give you an idea of the range you'll be looking at. Good luck. JohnnyK.