odocoileus, my 223 a-max load is 25 grs of varget , lapua brass,cci br-4 , the ojive ist 2.000 witch is 10 th in rifling in my gun . overal length is 2.455 . this gun is set up with tight neck holland reamer for manson i think. this reamer is 252 neck and similar to a wylde 223 reamer. kriger barrel has 15 shot es of 16. and average of 2983 fps in 60 degree weather when chronographed. also does well with 25.0 grs of rl-15. the gun is a trued action 700, with the ejector removed