I have a new 300 RUM in a Winchester mdl 70 stainless that I can't get to shoot better than 2". With the COL at 3.600 to still fit into the magazine I still have .130 of free bore. I have tried 165 gr interbonds, 180gr interbonds, and 180gr accubonds. Is it time for the custom shop or do I dump the gun. I was setting up this gun for a deer and elk gun. Maybe a new gun in 300wsm?