Bullet ID?

[Mover76]

Anyone have a possible ID on this? I found it among many other civil war bullets, and shrapnel. I think it's a pistol bullet, but I can't find anything that resembles it. The rifling is also throwing me for a loop. The other side is smashed from the rock it hit, which is still there today .

 

[UCVRelics]

Not much to go on but with those striations its a modern bullet.