Rl26 and N570 are going to be top choices.I have a 17" 5 groove 7.5t barrel from PBB. Shooting the 109 eldm, near the lands like i always start. Necked down ADG brass. I went up to 60gr with both n570 and n565 and tried both br2 and fed 215 primers. Zero pressure with any of the loads, had better ES with br2's and way more speed with n565(3100 vs 2930) so im gonna load up more of that combo, probably 60.5gr tonight and go shoot tomorrow.
Was gonna try rl26 too cause i have a shitload of that as well, but if the n565 does well i may stick with that for this season since its been more temp stable for me
Had great results with n565 actually. Getting about 3100 with the 109 eld-m in a 17" barrel. Got a ton more speed than i did with 570Rl26 and N570 are going to be top choices.