Keith Cochran lives right down the road from you and should be able to ID anything you find. You may know him. He is on Rock Store Rd, off hwy 61.
I live over in Cartersville. After you hunt for a while using the 250 you may want to get a better detector and hunt it again. Keith runs Bonnie Blue Detectors and will probably let you try out some different machines to see what you like if you decide to upgrade, he is a good guy.
If I were you i'd hunt that place myself and hunt it for several years. You'll be surprised how you will keep making finds. You should find some buttons, they usually read just above a nickel, cuff buttons read a little lower.
Everyone needs a site like this and I hope you'll hunt it yourself. You'll learn a lot from it and it will give you a couple of years of hunting if it is 4 acres. Then a new machine will open it up all over again. When you get ready to move from the 250 you might want to try a T2 or a Troy or a Tejon, if they work well there and they should.
Good luck and post more finds!!
Julien