Thats using a mix of AAC's 125gr pink tips, and 147gr .308 military pulls.
If you load for 300blk, using 147gr military pulled bullets and H110 is a super cheap way to go for plinking. I recently loaded 1k of them for about $250.00. 15gr of the H110 puts it at about 1800fps. Have heard of guys loading them up with 18gr and hitting 2000-2100fps but I see no personal benefit in doing that.
Edit to add: All the ones I load are supersonic. For the price of Sierra Match King's it's not much cheaper to load them myself than buy from the factory. Only reason I'll consider loading subs in the future is if factory 220 subs get REALLY hard to find.