Trying to decide between .300 Blackout or 7.62x39 in AR platform.

I've read some of the 300's have pressure/FTE/FTL problems unless you go with a pistol gas system.  I like using the same mags, brass and BCG but don't care for the limited availability and range of the 300.

7.62x39 offers a slightly harder hitting round with slightly more range with cheap easily obtained ammo. But has designated mags and may lack in accuracy to a certain degree.

Give me your opinions ... I really cant decide.

I assume this is for hunting?

Why is .308 not an option?

Will you be reloading?

I actually have a couple of .308's    AR10 and Bolt but I have a built lower Im looking to do something different with. Already have an M4 style and an 20" A3 style. Just cant see building another .223 and I have plenty of .223 brass I can reform and I have 7.62x39 on hand.  Would probably use the new build for hog hunting if I get the chance but wouldn't use it for deer hunting here in Kodiak. Just looking for pros and cons on either using the AR platform.

ETA: yes I reload so using my brass to make the 300 is a non issue

Does anyone make a fully reliable 762x39 upper these days? Curious more than anything.

Wondering about that myself

6.5 PCC









Reform brass (not an issue, right?)

Uses 5.56 bolt and mags too.



 

.300 black out sbr/suppressed would be a fun range toy/HD carbine.