So I keep seeing threads where people say the 10MM ammo you can buy in most places is just a .40 S&W round. IT is not the original 10MM round that had all the nuts when first developed for the FBI. I guess I dont understand what separates them. Some people say the some of the ammo you can get online is the real 10MM ammo but the grain count (175 for example) is the same as the stuff they call weak. I know I am missing something, please advise on what it is. Wanna kill these ads? We can help!