Lead head nail

[TN Song Dog]

Lead head nail - disregard

 

[EastTNHunter]

Looks almost like a lead head roofing nail

 

[mike243]

Aint no 22 round, weighs too much and not enough energy to expend that much I would bet

 

[Tenntrapper]

Lead head roofing nail

 

[Willysman]

Yep that's the lead off a tin roofing nail. Been around a while.