First trip to the range with my new Mark ii BTV this morning. Got there and bore sighted at distance. When I started shooting I was barely hitting the top of the target. Needless to say that was a bit of a shock. Then I remembered reading that the action screws should be torqued to 15 in lb's and I had them snugged pretty tight.
I backed them out a bit and tried again, next shots dropped right down to the bulls eye, so like I said I'm a believer.

Don't have an in lb torque wrench, but I got lucky and Midway had the Wheeler gunsmithing torque wrench on sale so I ordered it.