Last summer my dad purchased a new buckmaster 2 scope for his 300 wm. We sighted it in just fine. Just before hunting season we took it out again and could not get decent groups. It would be perfect at 100 yds and then all over the place at 200. We got it dialed in at 200 and its all over the place at 100. We sent it in to nikon got it back with little explanation as to what was done but got it dialed in for his deer. However he missed on an elk a few weeks later and we went back to the range and found out he was all over the place again. The rifle and load shot great with his previous scope so we are at a loss and I was wondering if any of you experts had any insight. We are always shooting off a rest at the bench or sticks when hunting and he is a good shot.