Not seeing any data from Speer using the 125gr TNT bullet in the 300 black out. I would assume that the Hornady load data would suffice but, then I am assuming things not knowing things. Anyone see any problems with this assumption? Have any of you tried this bullet in a 300 blackout cartridge? I will be loading for 2 different uppers, one with a 16” barrel and one with 7 ½ “. I don’t have any 125gr Hornady bullets to compare the Speer bullets to but the 125gr hp (#30192) would appear to be verry similar in shape, maybe not same in composition.