The 457 is universally praised on this Forum. I have two. Maybe it's my less than expert shooting, but at the beginning mine shot quite low. Like 7" below the bullseye at only 7 yards. Half the problem was the shooter (me) not having shot a 45ACP before; anticipating the (supposedly harsh) recoil and using bad technique.
I tried several different ammo brands and bullet weights from 165gr to 185gr to 230gr until I found what worked best for me. Maybe it's the short barrel but mine seemed to have point of impact vary a lot with bullet weight.
Experiment and find out. The worst that can happen is you get to shoot a lot of rounds. Boy, that'd be a real downer.