I'm looking to compile a list of legally available rifles that use the ammo listed below for further consideration. I will be "Googlng" this but figured I'd start here and ask if you know of a good rifle that you would recommend and why. I know of a decent Lancaster AK-47 that uses the 7.62x39 (I would think this is easily the most popular round of these) but always looking for more info. Thanks for your help. 
7.62x39 - 5.8x42 - 6.8x43 - 6.5x38
7.62x39 - 5.8x42 - 6.8x43 - 6.5x38