This is my first post to this forum. I will be going on a Dall Sheep hunt in 2015 and needed to hone in my long range shooting precision. I am shooting a .300 WSM in a Tikka T3 Lite. I don't reload so depend upon factory bought ammo. After purchasing boxes of ammo from 6 different suppliers, I found my best precision was with Nosler's Custom Accubond-180 grain and HSM's Berger VLD 185 grain. At 100 yards I can get 3 or 5 shot groupings of less than 1" in this factory rifle that I purchased a year ago. This is from a bench. The next step was to shoot at 400 yards using a bench. I thought I would be around 4" or 5" groupings, but found that I am averaging 9" with the HSM and 7" with the Nosler. Can anyone give me some advise on why my groupings are much larger than expected when I went from a MOA of 1 to 4?