I loaded blackpowder on Black Friday(.45/70 that day), as well as today.
Reading and surfing on the subject of .45 Colt loads, though I have long ago established a 'go-to' smokless load and blackpowder load and really wasn't looking for new info, got me in the mood to load some 3F Goex, again.
I bet I've read three dozen posts today(across the forums in Google search results) declaring that 40-grains won't fit in a modern case, but I've been doing just that for a good while.
A Lee .452-255 RF with SPG in the grooves, seated to the crimp groove in various brands of brass (no Hornady, though), over 40-grains of 3F Goex isn't hard to do at all. No drop tube, no compression die/wads/cards/etc....no deformed bullet nose using the same soft lead i use for my .566 Pritchetts for my P53 and my JP Murray....and that's 40.0 grains on my scales. My measure shows a little over 40.