BoogieMan, SAAMI has the only "official" standard for firearms ammunition. They don't go into any detail for bullet types at all. And their standars are voluntary for companies to use; there's no laws preventing someone to do or name something different.
Best thing to do is browse through all the info form all the companies then do your best to figure out what each one's abbreviations mean. There may well be two or more meanings for the same one.
Yes, it's a nightmare. But sleep the best your can after reading all that somewhat confusing stuff.
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