After playing with a lot of powders for my 338/06, I settled on two powders.

IMR 4064. I did on that one, because accuracy was superb, but also, with 50 grains of powder, and bullet weights from 200 grains to 250 grains the velocity is right at 2500 fps so I don't have to play with scope adjustments if I am using different bullet weights depending on my needs during a hunting season.

My MAIN powder tho, is H 380. It fills the case plus gives me the best combo of accuracy and velocity of all the powders I tested. It seems to produce lower pressures also. It is almost like H 380 in a 223, just makes it into a big 223 ( LoL).

Velocity with 63 grains with a 250 grain bullet in mine is 2675 or so. I usually use the 250 grain round nose tho. Brass is Winchester Nickel 280 brass necked up. Primers most times are Fed 210.

H 380 and IMR 4064 will both give half inch groups at 100 yds with this rifle. It is a bored out Winchester Model 70. ( started life as a 270).

Cheers and Good shooting
seafire

prop job! do you have any Blue Dot info on the .338-06. I can't find any.

Now if I haven't missed anything, it was a 10 shot group that was mentioned. The first shot matters a lot and the second only if you really need it. Equating a rifles hunting accuracy with continued multi shoot repeatability is not an effective measure of anything usefull pertaining to that rifle. If you are in a dog town I'll eat my words. Cold Bore accuracy is what is important.

Small groups on paper are fun but in my time of life anything heavier than 100 grains driven by more than 40 grains of powder is too punishing for paper work. punching holes with that .338 caliber will get old pretty quick. If that rifle is really for hunting shoot two shots and if they land within 1 1/2" of each other that tooling is performing just fine. roger