03-14-2020, 04:32 PM
grayfox Wrote:It has something to do with the over-bore of the cartridge, and maybe the length of the powder column, but medium powders like Varget are too fast for most 243 loads, leastwise at speeds I'd like. I do have (I think) an H4350 load for one 95sst load, but in general when I look up loads for the 95-100 gr class it is like H4831, H1000, 7977, etc etc. I have a great load for my 100 gr GK in H4821 but when you go to the 6 Cm, since the case is a tad shorter (and more efficient I think) seems like a bit faster of powder class is allowed. I can do Varget, H4350, 8208, RL 17, etc... and I do like the more temp-stable ones. Anyway, that's what led to my comment earlier, may not be the case, but I hope so.
The two most common powders I see used for 6CM is H4350 and H4831SC. Hodgdon stops recommending Varget for bullets over 95gr. I use H4831SC for 115gr DTAC and it works well. I think H4350 is too fast for even 105gr VLD but people still flock to it. I've done work ups using H4831/SC, H4350, RE16, RE22, and RE26. RE26 made the most velocity, H4350 had the widest node, and H4831SC had the best accuracy.