I've seen this floating around on blogs and a few ammunition websites. However I've not seen anything official from the ATF. Does anyone have a link to the official ATF ruling that this is referencing or has anyone heard about this? I'm trying to understand what this would mean. BATF Classifies .223, 6.5 Grendel and 6.8SPC as Pi All I see on the internet so far is fear and conjecture. It would be nice to have some facts as well.