Thanks Mehavey, that's really nice of you to provide the 260 info. Bad news, at least for the very short term, is that I don't have even one of the powders you listed. I'll give some thought and research time into which one to buy, though if anyone has suggestions (and are loading for a short barreled 260), I'm all ears.
Scratch that, I reread your info and I'll get the R17. Thanks much.