9mm diameter difference?

Plated bullets are essentially lead, and these bullets fill the chamber with less leading of the grooves when they’re oversized .001 to .002”. They obturate. http://www.lasc.us/Fryxell_Book_textonly2.pdf page 32
as described in detail by Glen Fryxell. The idea, as I understand it, is to have the bullet fill the bore as soon as possible without leading the lands.

More knowledgable comments forthcoming, I’m sure, but I’ve gotten the best accuracy following lead bullet data for my plated bullets.
 
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I have a G22 Gen 2, I changed my barrel out to a SS Match grade Wheaton Arms barrel. Fully supported chamber to eliminate any kind of case bulge. Also added a 9 mm conversion barrel for the G22, from Wheaton Arms, SS Match grade barrel. And I have the Glock .357 Sig barrel, so now I have 3 calibers in one pistol. The .40 S&W and .357 Sig use the same mags. For the 9 mm, I use G17 mags.

Reb 🤠🐩🐶🐕🐶🐕🇺🇸
 

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