Bill Alexander reads and occasionally posts on this forum.
I believe the Wolf Military Classic 100gr loading had his participation, and it's (I'm not sure but I suspect) very likely an actual military load.
Maybe he'll chose to participate in this topic.
For my own part, I'm noting that some bolt failures occurred earlier on in the development of this system. General consensus is that this could have been the result of some variations in evolving systems. The outcome of that is a Type 2 bolt.
I can't speak to brands or models. I can say that my systems use the AR Stoner barrels and type 2 bolts, but at this early stage, that's just my bet in the bigger pool. (Systems = 20" standard, and 24" Varmint/Target, both AR's.)
I have a spare barrel and intend to shoot the heck out of mine.
IMHO, home defense and SHTF are not so likely to be high volume fire applications. If my plans materialize, I'll be shooting mine for fun, and likely shooting up a lot more rounds than I'd ever want to be shooting in HD or SHTF.
My plans include 2-gun combat matches. Temper those plans with my own advanced age of 73.
Greg