Winchester lengthened the 12 and 16 gauge chambers in 1926 from 2 9/16" in 16 gauge and from 2 5/8" in 12 gauge all to 2 3/4".

Take the serial number down to be able to reference exactly the date it was manufactured. A list of serial numbers is in the back of the Blue Book of Gun Values.

If it is pre-1926, you may have the chamber lengthened as a first choice, or stick to firing the 2 1/2" shells available from Fiocchi and other sources, or load your own from those hulls or use the solid brass hulls from Magtech or Rocky Mountain Cases.

*Where's my blue book?*

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Lost it all in a boat accident