ponchy i agree with the shotgun slug and the next two are rifle bullets modern style the third one looks to be a full metal jacket military made as the heavy sealing crimp made with the case on the bullet and the last one seems to me to be a round ball of sorts not saying new but then again not saying old that is my best guesses. sorry i couldn't be more helpful . where did you find them in the woods or in someones yard ,feild .
but very nice finds for sure i have found a few of them myself but never a slug i had a very nice lead bullet that looked brand new i found in a neighbors yard and cleaned it and then couldn't find it untill the wife turned the disposal on then we both knew where it was at . lol.
keep hunting and finding the goods,
Scott