I have a SAKO 75, Schmidt 8 - 56 in .243. And pased my DSC1 with a touching group in the centre of the 4" target. I always use Norma 100grain ammo. I know this will sound silly, but I have found I shoot more consistantly off my bipod than I do off a sand bag. The latter I have only tried once and could not be consistant with my grouping. Being from Devon, we only use £5 notes to check barrell clearance. Good luck.