That right there! I have an AK in 7.62X39 and a couple of 300 Blackouts. I'll take the 300 Blk. over the 39 any day. Like Mike said, .223 brass is cheap as hell and can be found anywhere and it's easy as all getout to make the 300 brass. Most of the 39 ammo is Berdan primed and very difficult to reload. You can load the 300 with anything from 110 gr. to 240 gr. 30 cal. bullets and there's a whole bunch of different powders that will work.The way I look at it is if you're serious about being prepped for the Walking Dead apocalypse you will already be set up to reload, and not relying on what MIGHT be found in a scrounging situation as far as loaded ammo! in the reloading aspect, 300 has the 39 beat no matter which way you look at it!
And Wash, I'll bet I can load a 125 gr. 300 round that will roll hogs every bit as good as that Russian stuff!