Originally Posted by
Tacgunner
The most "fair" comparison would be two uppers, one in 300 BO, the other in 5.56. Both with 16" barrels and same optics. Ammo would be standard supersonic off-the-shelf ammo. Most folks would want to see these compared for defense/hunting uses.
After that, the discussion can go to sub-sonics and suppressors, or long-range challenge type stuff. Handloads are a subclass of the discussion as not everyone reloads (just trying to be fair). The 7.62x39mm comparison works best when talking reloaded 300 BO versus factory 7.62x39mm (what you can get outta 300 BO if not using factory 7.62x39mm). Plus, if there is no 7.62x39mm, you can always make 300 BO from .223/5.56mm brass (again, a reloading issue).