Can someone please tell me the pros and cons of each of these powders I am considering for a 338 /300 RUM? COAL is long at 3.965” and I am using FED215GM primers. Little temp sensitivity and low ES are important (obviously) but so is velocity and I was wondering if one of these powders is better than the other. RL25 and US869 are on all of the shelves around here but the H-1000 and Retumbo are rarely seen. The gun has a 30” 1:9.5 twist barrel. I know the common load is 92.0 gr of H-1000 but I am looking for some alternatives as well. RL25 H-1000 Retumbo US869 Are there any other good powders for this thing? Thanks.