7.62x39 is a great all-purpose round, and it’s suitably between the heavier .308 (7.62x51) and the smaller .223 (5.56). If you want to varmint hunt, plink, or wound, .223 works. If you want to hunt big game or men, .308 is the way to go.
At one time I thought the 7.62 only came one way.