Rick,
You definitely have a 13 Pdr case, but I'm thinking your projectile is a U.S. Navy 3 inch. 13 Pdrs are 3 inch diameter, so an enterprising former owner has most likely done a bit of cross breeding. A high percentage of the U.K. Pdr projectiles have the Pdr size imprinted on the base of the projo, and your bullet looks spot-on for a U.S. Navy one, especially the band.
Is there any info stamped on the base of your bullet?




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