Originally Posted by
hotbarrels
Big advantage of the 7.62x39 over the 300Black is (was) the fact that hunting projectiles used in this calibre where made for the calibre and its velocities.
300Black suffered terminal ballistic performance issues because of the lack of projectiles available that were designed for the lower velocity's as compared to the mainstay 308 Win and all the other higher velocity 300's out there. Hand loaders couldn't get reliably performing projectiles, instead having to rely on bullets tumbling on impact for effect. 300Black is only really coming into its own now that projectiles specific for the round are becoming more available. Problem is, a lot of people have been disappointed with it and moved away. This makes the marketing of the round a whole lot harder now.
Personally, I bought bulk Highland 7.62x39 brass cased 127gr PSP back when .223 ammo pricing went ballistic, and consider it to have been one of my best 'investments' yet.