some times powder is magic and you don't won't know till it's been tried
i keep getting more guns and so many haven't been shot once
. i started reloading 40 years ago with only 3 cartridges (really 2 and 1 came a year or 2 later, 270win) and those being 44mag (629), 264wm (pre64) and 270win (rem ?). it was easy as only having 4 powders (296, imr's 4350/4320/4831) and 3 primers (cci's 350/200/250). with the reloading world gone to
it's hit and miss on what's available and now starting over with what IS available. the last 9 or 10 years it's been a collection of newer cartridges (5.56/223wylde, 243win, 6.5gren, 6.5creed, 260rem, 6.5prc, 6.8spc, 300bo, 308win, 300wm, 338lm & 45-70gvt along with 9mm, 357sig, 40s&w, 10mm, 45acp & 50ae), AR builds and building BA's. if i ever decide on any certain powder and primer, it'll all start again as not being available, so the collection of what i do have makes it a +! with blue dot being near to nothing to find makes it nice to have already. my small amounts of rl powders (15, 17, 19, 22 & 25) won't last long (2# or less of each). temp stable powders don't concern me as i don't shoot in wide temp range and only develop in 70+ temps (usually 80-90*). i saw some 17 for sale in okc for $90+/#...........no thanks! i've just moved on to vv powders as they're in stock for all of my cartridges @ reasonable pricing.