Until I start marking my cases, I can't tell my .45acp cases from some that someone else has left. I consider it an annoyance, and requires additional sorting. If I am inspecting many cases, I can get in a groove and identify/segregate them, but these eyes will be 60 y.o in a couple month, and it ain't getting any easier.
I put the offenders in a plastic bag until I get enough to be worth the effort, and then I try to find someone to give them to. If I am unable, I might take some comfort in smashing the stupid things with a hammer. Thanks for the inspiration.
If someone loads 9mm, .40, and 45, maybe .38/.357, then having all SPP cases is great. Since I also load 10mm, .41 Mag and .45LC, it's just a pain in the arse and I'd rather not deal with it.
The fact that .45acp is the only case that has this issue (to the best of my knowledge) and that .45acp comprises about 50% of my total loading/shooting...this is a serious issue for me.