Moho
I shot a 1" last group with my 6.8 with just a bag on the truck tailgate. This was with a lead sled but the same in terms of shooting off the truck gate. Neither were ideal as I was leaning over to shoot without a chair at the right height. If I really want to dial it in, a proper bench and lead sled is the way to go for sighting in - IMO. Then I have no excuse when shooting lousy without it and know the gun's real capability.