Re: 338 rum reloading
In 2 different rifles, both trued Rem Actions, one with a Douglas barrel, the other with a Hart barrel, I loaded 87gr for one and 88.5 for the other, 3.630 OAL, CCI 250 primers and Remington brass.
The velocity for both was 2895 - 2910fps and shot 1/2 minute.
Both rifles have 26" 1-10 twist barrels and muzzle brakes.
Using the slower powders I did not get the accuracy or velocity.
I would start at 85gr and work up in 1/2 grain increments.
Hope this helps.