Some of the earlier lots of ammo (Late 2013 into early 2014 )had issues with powder charge variation and bad cases. These issues will effect accuracy. Many of us started weighing each round and grouping similar weights to help with the powder charge variation. The newer lot numbers have improved from what I have experienced. I have also had better luck with the 25gr stuff in the skinny barrel BMag. You may also try putting a small piece of rubber between the barrel and stock giving slight upward pressure on the barrel. Place the rubber under the words Bmag on the barrel, it has worked for a few shooters.