7.62x54R to .32 cal. Multi - chamber Insert - 167404, Gunsmithing at Sportsman's Guide
TFB Review: The Shooters Box 577/450 Chamber AdapterThe Firearm Blog
Could the use of 'adapters' which fit into the chamber and swapping of the bolt, extractor and other parts allow firearms to use different calibers as long as the new cartridge is
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