I've shot several thousand rounds of Rainier and Berry's plated bullets thru my Glock21 in .45acp or .400corbon.
I've even retrieved some and the jacket/plating was not torn at all.
They are as accurate as I can make them be. Mind the crimp, like others have suggested.
Also, copper plated does not equal jacketed. There is special loading data on Rainier's site for their copper plated bullets. You treat them more like lead than jacketed.
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