I don't know if the following information applies to you, but I just got through dialing in my Savage Model 10 in 308. Similar issues; group a couple, throw a flyer, no pattern. It has the plastic stock, so I ground out the honeycomb in the fore end and epoxied two 1/4" steel rods in the channel to stiffen it. Then I bedded the action with JB Weld. First 3 shot group after the mods was .55" , Consistent .75" shooter now.