Need accurate measurements. It doesn't look like there is enough patina on the lead to date back over a hundred years. The photo looks to me like it's relatively new or fresh.
It's for sure over a hundred years old. The rings and shape give that away. The patina is off a little but it resembles a fired or mangled civil war bullet. I've dug a lot of cw bullets and their all white. Soil might play a factor. But it is very old