I'd be sending that McGowen back if my 243 shot like that.
I don't won't to hurt anyone's feelings, but I have to agree with the above. My 243 and many others are very accurate. Shooting <.200 groups @ 100 yards and <.400 moa at 300 to 400 yards should be the norm with the right combo of bullets and powder.

IMO it's one of the best all around rifles made.

Dennis