Ithaca's Deerslayer barrel was new when we got into the Nam Mess. It was a cylinder bore, but bore diameter was only about .690", actually what a Full choke runs in 12 gauge.
These worked great with rifled slugs of the day, buck results were mixed. Some loads produced excellent patterns, some not. Use with birdshot showed results similar to regular Full choke.
I suggest measuring the bore at several points. Betcha this barrel is one of these...
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