I have had my best luck with Big Game, shoots very good, meters in a measure and goes 2800 fps with 210's, mine is a 24 in. barrel. I am at work, but believe I was loading 62 grains in resized .35 Whelen cases.
RL15 will work, H414 is good as well, but for me Big Game is perfect for this one.
I just looked, the Ramshot guide doesn't have the .338-06, but the .338 RCM shows 61 gr Big Game for 2729 fps, so I think my guess was correct. I think I loaded 62 with 210 TTSX and 63 with 210 Noslers.
Last edited by jstevens; 09/18/12.
