My cousins German made 7 Mauser is shooting 24" groups at 50yds!! He even recently had the barrel sporterized and re-crowned. The stock is a new synthetic, but he didn't customize the bedding. The rifling is pronounced but rounded on the edges of the lands, of which there is only 4 and 4 grooves. Could there be another culprit contributing to the poor groups other than the barrel? Any suggestions would be appreciated.