Sorry guys but I have a totally newbie question here. I have been doing load development for my recently purchased 300RUM for the last two months and have had great sucess(for my standards at least)finding several loads that are below 0.5MOA and one that is consistently at 1/4MOA. I am using Reloader 25 as the powder for all loads. The only thing that I am worried about is the fact that all of my shooting has been done in temps between 15 and 25 degrees. I have seen other posts wherein people stated that the loads they developed in the winter did not shoot well in the warmer months. If this is indeed the case is it due to increased velocity/pressure? Would I be able to remedy the problem by lowering the powder charge until I acheive the same average velocity that I got during development. Any information would be greatly appreciated.