You never said whether you are shooting a bolt or gas gun. I'm shooting a Ruger American. I've been looking for, but not finding, some more 6.5 Grendel friendly powders, namely Benchmark and 8208. Probably should consider some TAC too. Anyway I found data for some powders I had on shelf and tried them. IMR4198, IMR 4895, and Rl 15. Other than the Match Burners, I had some .264 95 gr. VMax and 120 gr. ProHunters which I loaded up also. All 3 powders shot some impressive groups with the MB's, the other bullets not as good but still under 1" 5 shot groups for the most part. The best was 28.5 Rl15:
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Factory Nosler 120 Ballistic Tips shot very well too.
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I'm chomping at the bit to get back and fine tune some of these loads but I'm going to wait until the deer hunters all get sighted in. Other data; Nosler brass, CCI 400 primers, RCBS dies, shot off of a bipod with a rear bag.