voodoo_man
Established
Every .30 cal bullet ever designed has been designed to work best at high velocity, why? because it's a rifle caliber, rifles have fast bullets.
.300BLK just tried to follow-along and borrow the same caliber. Realistically, the whole predicate of .300BLK is that it shoots heavy bullets subsonically, and fits in an AR-15. If someone had invested the effort in making a .357-Max fit in the AR-15, you would still be using pistol bullets, out of an AR.
There are bullets out there that are designed specific for the BLK, in all honesty, I can't think of a single reason I would want to defend my house with an NFA weapon, that puts me at far too great a risk of 1) Losing my gun/suppressor 2) explaining to the court why X or Y wouldn't do.
My suggestion, if you're going to use a rifle to defend your house, shoot the fastest bullets you can, if you have to shoot to kill, make sure you come out on top.
"I didn't want to wake the baby..."