Anyone have the inside Diameters for Rem 12 & 20 Gauge Barrel??

[BD1]

Thanks Bill

[Sloppy_Snood]

727" - .729" for Remington's standard 12GA 870 Express, 1187, 1100 Autoloader, 332 O/U Wingmaster RemChoke barrel bores (newer shotguns).

NOTE: Some older "Target" -stamped barrels were .735" to .746" Depends on the age of the barrel really.

.735" for Remington's 105CTi, 1100 – new, 1100 G3 - new, Premiere O/U Competition STS, Premiere O/U Field Grade, Premiere O/U Upland Special ProBore barrel bores.

.620" for new Remington 20GA RemChoke bores.

NOTE: I measure most at .615" - .617" if they are older than 2 years old from the year 2010 ).

Best bet Bill is to have a machine shop or gunsmith with a holtest measure it.