This is such a tired argument around here. I think this problem stems from the mix between bench rest shooters and guys that just like to shoot for groups. I'm one of the guys that shoots for groups.
A bench rest shooter doesn't call a gun a .4" shooter unless it can repeat time and time again. I don't have all the fancy stuff to even attempt that level of repeatability. I shoot off sand bags and sometimes I shoot .5" groups and sometimes I shoot 1" groups but I'm usually around .75" groups.
Hoyt, if you're happy with your rifle and feel comfortable calling your rifle a .4" rifle. Then so be it. The general consensus and mine as well is most guys can't shoot what they claim. While I'm sure RR could shoot a .4" group at 100 yards consistently I don't feel he'd come anywhere near that number at 700 yards or heck even half that. he'd likely be a world record holder if he could.
Anyone can be amazing once and if that makes you feel good, go for it.
Tom