I'm just curious if any one has tried using the 5.7x28 on yotes. I know many people have used a 22mag and since the 5.7 is similar to a 22mag topped with a better bullet, it should work. Obviously, one would be limited in range, say 150yrds. I'm in the process of putting together a new 223 AR pistol for next season and I keep seeing the 10.5" barrel 5.7 uppers and can't help but like the idea. Definately not route I'll take in the end but I figure somebody must be using one already.