I've been doing load development with my 260 the last few weeks. Still got a bit more work to do but my best group so far has been with 47.6grn RL26 doing 2660. This was a 5 shot .64MOA group. Got a similar speed using 45.6 grn of superformance, going to try push it a little further and see if I can get up over 2700fps.
That's using Lapua brass, federal 210m primers and 143 eldx
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