I've found that .357dia. cast bullets are much more accurate in my Beretta M9 than .355 or .356. I use only LSWC or TC designs without any problems. I can't say that I've actually measured my bore, but let group sizes tell me the truth.
FWIW, I've also never found a plated bullet that could match the accuracy of a good cast bullet or, for that matter, a good jacketed one. At a small savings over jacketed and a small premium or cast, plated bullets just aren't worth using AFAIC.
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