Two 6.8s. One will be a bench gun (heavier), one will be a field gun. I have a .223 Wylde 16" barrel, I already have a Colt Match Grade HBAR 5.56 in 20" A2 config... the 16" will be a flat-top (with glass) gun. Now, he's offered up a new Wildcat (my first time getting into a Wildcat... his .22 'Yote Smoker. a .223 bullet and a 6.8 shell casing. That thing should be a rocket. Oh yeah.... and I also have my Bison 8.5" pistol I named Buffalo Chip (in 6.8).