The 3" chambered barrels only have single gas port and the 2 3/4" chambered barrels have 2 gas ports so getting 2 3/4" shells to cycle
reliably in a 3" chamber is kind of hit and miss.
In 1984 S&W came out with the Model 1000 Super12 that would shoot anything from 2 3/4" field loads to 3" magnums.

KO