Interesting thread. I have a T3X in 7mm RM. Limited by mag length obviously. I have tried RL26 - could get sub MOA fairly easy and even 0.5 with half mil jump (less than mag length) and 67.5gns doing 3000, but found the velocity spread was a bit more than I would have liked (30 fps). If trying, reduce by 10% and work up.
Also tried RL22, way more stable for velocity spread, i have ended up with 68gns RL22 doing 3160 with 6fps variation for group 0.5 inch group 100 yards, Nosler brass, fed primers, 140 Nosler. accubond. If trying, reduce by 10% and work up. Interestingly, Nos;er partitions also showed good promise (0.6) Looking for ward to testing on game next couple of weeks.
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