I have a custom Savage 6.5 WSM with a Lilja 9 twist barrel with a Sharp Shooter Supply recoil lug and trigger. It is pillar bedded into a Stockade Rifle Works stock with marine tex. I am not the original owner but according to the original owner the work was done by a gun smith. This rifle has exhibited some vertical stringing at 100 yds with 3 shot groups going around 0.8" to 1" vertical with less than 0.2" horizontal spread. It won't do it every group. A couple of weeks ago I shot it with a buddy and it did it to me two groups in a row, then he shot it and it clover leafed about 0.25". I shot again and it scattered the shots, then he shot again and it scattered them. At least I know it isn't me. Bullet is the 140 gr Sierra SBT. It is floated all the way back to the lug. I don't know what parts of the lug are bedded and which are free. The action screws were not loose. The scope has been reliable for me on other rifles. My loading technique is quite consistent, and I don't let the barrel get more than warm to the touch. I'm thinking that it is a bedding issue. I wonder if I need to rebed the recoil lug with only the back touching and maybe put a small bedding pad in front of the barrel nut. I don't know the usual bedding technique for savages with the barrel nut. What do you guys think?