✅ SOLVED 12 groove large calibre round

[Bifferino]

Found near Williamsburg VA back in the 1970's. Unlike anything I've found. Thanks for the help.

 

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[skeeterd]

Measurements??

 

[Dixiegal]

Well it looks like a mini ball but what are the dimensions? If its .5 inch its a .50 cal and if its .54 inch then its a .54 cal or a number of other calibers. It always has to do with measuring the diameter. If its not a normal american dimension then its in millimeters for a European rifle.

 

[Bifferino]

Thanks for your responses. it is at least .5" in diameter, but I'm using a tape measure so it's not exact. The nose of the bullet or minie ball is flattened from impact but doesn't match up closely to your normal minie ball.

Update: I think I have found this to possibly be a .575-470 Modern Mini Ball or something similar.