Re: Bore Sighting & observations
I beleive it's simply the barrel harmonics at work here. But an interesting test would be to have that barrel cryo treated, reinstalled, and rezerod to see if the results repeat. Then take the barrel off and set it back just enough so that the barrel would turn 90 degrees from where it is now and shoot it again and see if the misalignment goes up or down instead of to the side. But I can see where these results could be argued with having to recut the chamber and probably the crown in order to set it back properly. This alone could easily influence the results of this very non-scientific test.
Kyle, think about your answer. A scope hole/mount misalignment wouldn't cause this with Dave making the statment that the rifle is currently "sighted in". If the scope was set at mechanical zero and you looked down the bore and the crosshairs are off then yes that would be a true statement.
But once you adjust out any misalignment of the holes with the adjustments of the scope then that takes that issue out of the equation.
Regardless of the alignement in a perfect world, if your rifle is zeroed.... in theory your crosshairs and bore are pointed at the same spot X distance downrange, but your scope tube could physically be pointed to the left right up or down. That's why we have adjustable crosshairs.
I see we posted at the same time. I would probably rule out any stress also if your rifle holds a good zero through a heat cycle. and knowing you, you have already tested for that. So I think this would back up the harmonics theory.
Try a completly different load that shoots good enough to get a really good zero established and see if the centerline of the bore is pointed in a different direction or possibly right down the center.
BTW: good point about recording your true zerp point using your bore sighter grid. Simple solution, but never thought of that.
[ 11-12-2004: Message edited by: Steve Shelp ]