I have a Bushmaster Varminter .223 with 24", nice trigger etc. What I want to do is get a .243 upper and barrel of similar length and go deer hunting with it. In WI and ND we can use a centefire .22 cal, but some of the shots in ND can be a little far for a .223. Does anybody have any experience with a .243 AR rifle? Any recommendations for barrel manufacturer? DPMS makes a .243 barrel, anyone else?