So, am I correct that chamber inserts for shotguns would allow a 12 guage 3 inch magnum to use 20 guage and 410 guage shells. How about slugs shells with chamber inserts?

Is it correct that such a shotgun already allows use of all other 12 guage shells without an insert?

Am I correct that a single-shot or bolt-action rifle in .223 could use chamber inserts for .22 LR or .22 ammunition, or any other rimfire ammunition with the same bullet diameter?

Do I correctly understand that use of chamber inserts in lager caliber rifles follow the same principle regarding bullet diameter, and that using chamber inserts for much smaller ammunition would tend to less reliable shot placement and lead to quicker barrel fouling?

And are there chamber inserts or equivalents for single-shot or revolver-style pistols?

Edit: http://www.mcace.com/adapters.htm

http://www.mcace.com/shotguninserts.htm


My interest is to be able to use the widest range of ammunition with each gun.