Kachok
Member
OK I have been racking my brain over this one for some time and cannot dream up anything close to a rational answer. I load for 11 different cartridges I am not new to this but when loading for my 7mm-08 I was frustrated to no end because all of the powders that were supposed to work great for it shoot horribly with ever bullet and every charge. I had never given up on a rifle before but I was damn close. Well to make a very long story short I finally found two powders that did not just work well, they worked well across the board, like hitting a light switch all the sudden I went from groups that I am too embarrassed to share (when I could keep it on the paper) to drilling 1/2" groups and even a few lucky one hole groups and doing it in every bullet weight. The two powders that worked were H380 and Big Game they have one thing in common they both are very smooth spherical powders, now I don't recall anything in any manual about the texture of a powder making any difference in accuracy but the difference was so stark that is has me guessing, I know they are both close in burn rate but so are RL15 and 4350. Does anyone know why both spherical powders I tried could behave so differently then the extruded powders? Oh and before someone says anything about metering I was weighting every charge. I don't think it makes any difference with 4350ish burn rates but I was using standard CCI primers I don't normally use magnum primers until I hit RL22/H1000 burn rates which are way too slow for a 7mm-08.