I have two Remington 1889s, one made in 1891 and the other made in 1903. The chambers on both measure 2 5/8". I think that is typical of 12ga guns from that era.

(update on 3/15/18) Oops, sorry, let me correct my above statement - The chambers on the 1903 M1889 measure 2 3/4". I doubt if it left the factory like that, my guess is the chambers were lengthed at some point during the gun's long history. I have four Remington Model 1900s and a Model 1894, all of them have 2 5/8" chambers. They were made during the same era as the Model 1889.

Last edited by Jack71; 03/15/18 05:50 PM. Reason: correct an error