Especially using a powder like Titegroup - I used 5.0 gr under a plated 200 gr RN, but it's such a dense powder that it doesn't take much case room at all, and you look at the charge and wonder if you have enough there.Going from 223/5.56 to .45acp, is what set the hook for me.
I learned a lot online, but went at it alone - and it kicked my ass at times with bottleneck rifle - but something like 45acp, my biggest concern was making sure I didn’t double charge (as the charge doesn’t eat up much case volume in 45acp).