Originally Posted by
Dutch
Sabotloader,
This is really great information. I just finished cleaning the rifle, so I reassembled the way you suggest with the tapping proceedure. I have squeezed the forearm and pulled back just as you describe above. I could not detect any inference. The dollar bill test and the printer paper test both stop at 5.5 inches above the lug screw. This seems fairly far forward to me. Do you think this area needs to be sanded to clear the channel further back? It is the black plastic stock. It feels quite flimsy out at the end. Two bills will easily fit in the gap near the end of the stock. The double bills will slide down to within a half inch of the spot one bill will reach.
If it were mine I would positively say yes that area really could be your problem as the barrel heats and expands. Further if there were more pressure on one side or the other it would move POI away from the pressure.
The ideal of the Cantilever lug is to float the whole barrel to the recoil lug. They went to this method as that allowed them the flexibilty of creating a stock that would fit a whole of barreld actions with very minor hand work at Knight.
The best method would be if the stock fit snugly at all surfaces that touched the barrel. If you were to fully bed the stock that is what you would do.
If you take your stock off again look at the bridge, from one side of the stock to the other. just behind the lug pocket This and the recoil lug should be the only contact area in the stock...
If you want to do an experiment, find an aluminum pop can and cut a shim from it to fit in the bottom of the lug pocket. Insert it in the pocket and locate where the lug screw hole is. Then with a hole punch punch a hole in the shim. Now install the barreled action again - I bet it floats or is really close to floating.
Another thing if you look closely at the barrel channel in the stock you might be able to see polished area on the support rails where the bore as worn a smooth shiny spot.
I think you have really found your problem and very light progressive sanding is in order. Do not sand the bridge...