What are the advantages of 7.62x39 to .30-.30? Really got an itch for the Ruger American Ranch, but already have a H&R Handi-Rifle in .30-.30. The RAR seems like such a handy utility rifle. Know the 7.62x39 surplus/military ammo is cheaper, but are there any other pluses? The RAR is cheap enough, so will probably scratch that itch anyway. Just wish it came with ghost ring sights. Thanks for your input!