I have a 1904 Baker Batavia Leader 12ga twist barrels with considerable pitting and multiple small dents.

I've used 'Four Tenners' for years. They add about 10 oz. and about 9" long. When a smaller guage load enters a 12 bore, pressure drops rapidly.
I see the 'Four Tenner's for sale now and then on the gun sites.
They were made by Savage.


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