Civil war bullet identification

[Tigerdude]

I had this bullet on a different forum. Just discovered this sub forum. This is what I believe to be an enfield. It's diameter is approximately .544-.547. It weighs 516 grains and length is 1.21 inches. What's strange is that the bottom is neither solid or hollow but is crimped in. Any ideas?

 

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[Spats]

Probably an Enfield that has been altered. Looks as if something like pliers was used to crimp the back end of the bullet. Could have been done to make a stopper or some other gadget or just a soldier entertaining himself in camp.