SP 45 has been around for while. I prefer the LP, but I hand prime and changing everytime I go from LP to SR primers can be a pain. Plus the Lyman brass working station needs changing when I change as well. I almost wish they made a LR primer for 223 at times.daveg.inkc said:I thought all .45 acp was Large prime. Is the Small Prime new? As in brass made since 2000?