Help? Bought a used Mark 5 240 WBY Deluxe and can not get it to shot less than three inch groups at a hundred yards with random groups, shot off a rest. I have tried 85 and 100 grain with nominal changes from both factory and reloads. Check the bases and mounts at least 4 times. Swapped scopes Checked the stock screws (wood stock) It has the quick release Talley rings and bases, wood stock, 24 inch barrel. First scope was a new Trijicon, second was a recent rebuilt Leupold. So I was going to start by having the stock bedded? Is there a better choice and what am I missing?