My 1899 vintage 16 gauge Model 1894 AE Remington is marked 276 on the right barrel and the constriction is .018". The left barrel is marked 278 and has .027" constriction.
I have two 16 gauge 1900 models - I'll try to measure them tomorrow and post the results here. I'm glad to help with this project, it is something I have often wondered about.
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