30-30 chamber adapter i made from a steel case 7.62x54r : r/MosinNagant
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
Amazon.com : Firefield .243/ .308/ 7.62x54 In-Chamber Brass Boresight with Red Laser : Sports & Outdoors
12GA to 10MM Shotgun Adapter - Chamber Reducer - Stainless - Free Case & Ship !! | eBay
7.62x54R to .32 cal. Multi - chamber Insert - 167404, Gunsmithing at Sportsman's Guide
Z.P.V. Proizvodnja 7.62x54R Headspace Gauge Set GO and NO-GO