Here's what you need to know about the pros and cons of the .300 Blackout vs 7.62x39 cartridges. The better choice of the two is
300 Blackout vs 7.62x39: Everything You Need To Know
Can I shoot 7.62 x39 in my 300 Blackout? - Quora
Can I shoot 7.62 x39 in my 300 Blackout? - Quora
Pro's and Con's of 8.6 Blackout
Dear Ron: What's the flattest shooting rifle? — Ron Spomer Outdoors
What is the maximum effective range of a 300 blackout? - Quora
300 BLK vs. .300 HAMR: Which is the Better Cartridge?
300 Blackout Ammo for Hunting: 5 Great Choices - Wide Open Spaces
300 Blackout vs 7.62x39. Everything You Need To Know
300 Blackout (BLK) vs. 5.56: What's Best For You? - Pew Pew Tactical