That sounds unusual for a 457. They are usually good shooters and the sights are on for that particular ammo. I know everyone dislikes to hear it as much as they dislike to suggest it, but shooting from a good rest or letting someone else who you know is a good shooter try it is the first thing to try.
As an example, I watched a guy and his friend shoot a new 44Mag Redhawk with factory 180gr loads one day and they were all over the place. I was doing pretty well with my 4" 629-4 and 240gr handloads. So they asked me to try it. Danged if I wasn't throwing stuff all over the range with it to, even from a bench. Thinking it was the ammo, I tried some of my handloads, surefire performers in my Redhawk (and 629). They shot great, and the gentleman who owned the gun shot them well too. It was an ammo issue with that ammo in that gun. It shot somewhat better in my 629.
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" I said, good DAY! "
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