I will soon be starting to reload for my guide gun and think I have narrowed down powder choices to two, H-322 and RL-7. I have pretty much made up my mind to use the speer 300 grain HP and try to see how close I can get it to replicate Buffalo Bore's 300 grain ammo (they claim 2300 fps from a guide gun). The Hodgdon website has a lot to say about its powder but Alliant's website says almost nothing about its powder. Some here claim they get more velocity from RL-7 at a given pressure level than from H-322 which is a good thing, but for hunting conditions I have other concerns. For instance, which powder would be less temperature and position sensitive? I also plan to use dippers to measure powder loads so I was wondering which powder would dip more accurately.