Doc
Virgin Valley went out of business in 2004. Match Grade Machine purchased all their shop equipment and Mark Stratton a former employee still produces various Contender/Encore equipment.
So your barrel is about 3 years old.Due to the high intensity of that cartridge I would look for two problem areas. One the crown and 2 heavy copper fouling.
The other folks already alluded to the pressure points. Their advice is sound.
MGM and Stratton are both located in Southern Utah around St. George.
Best wishes, Bill