I just built a 8.3" 300 Blk. It's running well so far, digesting both subs and supers just fine. I've got a little more tweaking to do with my buffers and SLR gas block to get it tuned the way I want it, but it's real close.
I shot some Rem Hog Hammers and some Rem 220gr subs this past weekend (because that's all I can find local) and both did well at the short range I was shooting. More testing to come.
As to deer boolits, if the Barnes will expand they'll be great. I'm fairly confident that the Tac-TX will work well, as well as the Hog Hammers. The Hornady V-max seem to hold together fairly well also, being that the BO is a low velocity round.
