polack, that is exactly what i found as well. The 165gr grouped fine, but they were'nt grouping where i was shooting like the 150's did.

I am going to start my process all over again with 2 boxes of core'lokt, and 2 boxes of Win Xp2 (both 150's) and then just for giggles after sighting it in, try 165 gr and see what happens. I will be cleaning the rifle between boxes to keep it fair. My rings and mounts were very tight. i tightened everything before i left and checked them after each group.