I've had good luck with 120 Nosler Ballistic Tips in my Grendel's.
Put them over CFE 223 and Fed AR Match Primers in Hornady brass and it has shot 5 rounds in a very sub 1/2 MOA group at 100 yards.
Those are my back-up if the Barnes 115 TAC-TX's don't fly good in either AR15 uppers