Re: Powder for 300 RUM?
H1000 will work although it isnt as well suited for this task as some other powders. Retumbo and RL-25 are near impossible to beat for the 300 RUM with anywhere from 155-200 grain bullets. The barrel life is short enough, dont waste precious bore life with the rest.
Note, many have had good luck with Retumbo and some have had so-so success. I have not seen anyone use Rl-25 in the 300 RUM and not come away with somthing awesome, myself included. I dont mess around with anything else anymore.
Long range shooting is a process that ends with a result. Once you start to focus on the result (how bad your last shot was, how big the group is going to be, what your buck will score, what your match score is, what place you are in...) then you loose the capacity to focus on the process.