For the lapua shooters out there, I just aquired a 338 lapua and need to work up some loads, I have 250 gr scenars, and lapua brass, what powder is the best choice? I have re 22, and imr 4831 on hand, or should I buy some n165, h1000, or retumbo? I used some re22 to get it on paper but was not real impressed thus far. Any thoughts would be greatly appreciated, as I dont want to waste too much $ on fiddling around.