Hey I'm sure this topic has been beat half to death but just bought a lightly used Alberta Tactical 338 lapua ackley improved with 29" rock creek bbl and the previos owner loaded 300 smk to hs mag length (3.7?) and 110 grns of us869. I'd like to use h-1000 or retumbo and run 300 bergers just off lands just wondering the starting loads for smk and bergers with these powders when seated .010 off lands. Also wonder if CCI primers will be of choice. Any shared knowledge would be greatly appreciated because no one in my group of shooting buddies has a 338 lm ai. Thanks fellas ahead of time!