Just purchased a blued heavy barrel B-Mag in 17 WSM. Out of the box accuracy at 100 yards was marginal at best - only 1 1/2" to 2" 5-shot groups. I noticed a very flimsy stock at fore-end. Installed three o-rings between barrel and stock about 2" from end and tightened securely with zip tie.
This greatly improved the accuracy. The rifle is now shooting .375" - .687" groups consistently at 100 yards using 25 grain Winchester HE Varmint factory cartridges. I hope this helps others.