I agree...Try different ammo....My .243 groups 2 inches with federal 75 grains and barely half an inch with remington 80 grain hollowpoints....Whey you find some factory ammo that works for you, that's when you've got to drop some dough and stock up....
Keep in mind factory ammo doesn't have to be the most expensive stuff out there to group well...Over the years for a variety of different rifles I've always enjoyed great performance from Remington Express ammo and more often than no it groups pretty well....