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
MidTen 7.62x54R Bore Sight Red Dot Boresighters with Three Batteries, Sights - Amazon Canada
7.62x25 insert for 7.62 x54r chamber | Gun and Game Forum
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