I stopped into my local gun shop on the way home from the range today, and while I was walking around I saw two Mosin Nagants on the used rack for under $200. I handled them both, and I think I want one. I'd like to start a collection of older historical guns, staring with a Nagant and a Garand. Now, what do I look for on a Nagant to make sure it's worth buying? How do I tell if I'm getting a good price?

Also, what ammo is recommended for use in these guns?

Thanks
Dave