I have a 338-06 with a 30 inch barrel that i built to shoot long range target and mid range hunting (1000 / 500 and under) but i haven't taken the time to really work up a good load. The only load i have was worked up for my rifle and was 49.x gr rl-15 under a 250 grain matchking. That was with fireformed mixed head stamp military brass. as always work up any loads with caution and good luck.