Anybody know what this is?

[dangertree]

a .45 lead bullet pushed into a 1/2" copper pipe cap.

do i win anything?

 

[jennis]

I think 'Dangertree' hit the nail on the head...............

 

[reloader]

looks like a .452 hollow point out of a C-H swagimatic with one of the old Herter's half jackets.