Are you sure he's not flinching? How's the trigger?Update.
Pulled action screws off and retorqued. Then loosened the scope ring screws. Evened the gap on each side and torqued back down.
Went out and shot the hornady eld m. Didn’t have enough time to try another ammo as time wasn’t on my side but the Eld m were just as inconsistent as the eld x. Next trip gonna try a box of federal 140gr. Eventually will find the ammo this rifle likes