title says it all. New 300 RUM - working up some "starting" loads for barrel break-in and fire forming brass. Have RL-22 and 208 AMAX bullets on hand. [Will be using Retumbo and 210 VLD's after break in (unless the rifle really likes the 208 AMAX's).] I cannot find specific info for this combination, but think that 86 Grains of the RL-22 would be a good starting point. Can anyone confirm with there own proven data??