I use my 12” 6.5 Grendel, 90 tnt hand loads are amazing on coyotes, I feel comfortable out to 300 yards with it. I also have a 10.5” in 556 that is surprisingly accurate with heavier bullets but I haven’t shot any animals with it yet
I just bought all the parts to put one together. Also have a 16" Ballistic Advantage 8-T barrel. I intend to apply it as a SA specialty pistol and not an SBR. I'll be going with 60-73 grain bullets and probably a VLD magazine.
I have an SBR. I have uppers in 223 and 300 Blackout.
I use the 300 Blackout a lot more around the farm.
I have been shooting some Megtech 147gr in my 300
They do very nice.