:banghead: I know I saw this posted elsewhere in the forum but did a search and can't locate it. 38 Special +P is stamped on the case of a cartridge. It can handle +P loads. Other cartridges, without the stamping, are standard pressure loads. Now, what is the difference between the brass? I've heard wall thickness, yet when measuring can find no discernable difference. I've heard different chemical composition of the brass but find that hard to believe. I've heard no difference other than the head stamp (presumably for sorting and legal purposes) which I'm more inclined to believe. Does anyone have any idea what the difference in the cases are? Thanks.