Need an opinion....additional information, and a shameless plug

Hi, I was working a soccer field at a park in a neighboring town. Iwas hunting in the coin and jewelry mode on my XLT, when I got a solid dime reading showing 4.5 inches deep. Out of the hole comes a bullet. I didn't really pay much attention to it, just dropped it in my finds pouch and kept hunting. Soon another hit, then another. Ended up with 9 bullets total. I was thinking that they were .45s at first, but when I got home and took a better look, I realized that they were black powder bullets. The patina doesn't look right for civil war era, but I don't know much about muzzle loaders either. Can anyone help shed some light on what I've got here? If better pictures are needed let me know and I'll see what I can do. Most of the bullets were measuring around .57, .58 with the calipers except number 9, it measures approximately. 47.

I stoped by Dixie Gun works today and talked with them about the bullets that I had found. In the late 70s there were some civil war reenactments held there. They had a firing range for the muzzle loaders. In the late 80s or early 90s, they took the berm down and used the dirt as fill for the soccer fields. Ther is a LOT of bullets there. Me and a friend went out today and he found 14 bullets, and I found 19. A total of 42 bullets in two hunts. We were tired of digging bullets. ( considering that they were new )
For anyone interested in the civil war, or anything black powder, knifes, swords, or mountain man era, or old west, check out www.dixiegunworks.com . Or if you happen to be even remotely close to Union City, Tennessee, stop by and check them out. The store is awesome.