Running 75eldm from an 18" 22cm. Loads sub moa at 400y with minimal load development. Running 3100fps. Shot two mulies yesterday . First was large body buck at 275y(2600fps impact), in the shoulder crease, did a 50y death sprint and piled up, massive lung trauma, deer bleed out profusely from the mouth before I got to him, no blood as I cut neck, it was all in the boiler room and on ground. Nickel entrance through a rib, exit was quarter size throug a rib. Next was another medium body buck, 475y(2250fps impact), strong crosswind, but my nephew who's never killed a deer, put the bullet at the neck shoulder junction, pencil entrance, quarter exit. That deer was lights out. I was impressed. I have quite a lot of the 77s as well, and may try some. This load is no pressure, and is only 40gr H4350 I feel another 150fps is on the table. I only have 65 rounds down the pipe so will likely gain more speed, however initial 20 rounds were 3050, now its at 3100.
Edit, put another 55 rounds down the pipe today, loads now running 3160 fps. Barrel has been heavily cleaned 2 times. Minimal copper/carbon fouling. I just feel. An 18" barrel picking up 110fps through break-in seems a bit much.