hornady's 9th probably has the largest published dataset available for the 300 blk.
Nosler's 7th (paired with the 7.5 web updates that are out there) and proably 8th (which i haven't bought yet because i dont use many nosler products) is the 2nd choice.
the Lyman AR manual has about 2 pages of it - lyman 49th doesnt have a single peice of 300 blk data.
gernally speaking - make sure you avoid the 110gr 30 carbine RN bullets. they're about as usefull in a blackout AR as udders on a bull. their profile just inst conducive for feeding.
otherwise there are a lot of good choices out there for supersonic loads.
as others have mentioned 300blktalk.com has quite a bit of data available there, but always remember to use any web published data only after you've verified it against another source first - preferably one proofread by a laywer before it was published in book format. Typo's DO happen. and as every smart reloader will tell you - a pet load in one person's gun isnt always going to be safe in YOURS. some of the powders commonly used in the 300 blk - notably H110/w296 - are not prone to being forgiving on the top end of their load ranges.
hornady's 9th is only $30. which i consider to be a steal, considering the ammount of data it contains for the blackout alone.
