accuracy problem

[TC4ME]

I shoot a Black Diamond and was getting solid one inch groups at 100 yds. The last time out at the range I started getting verticle inconsistency, no problems left and right. I would adjust the scope back to where I wanted it and get no more than two shots before it would wander either up or down most of the time it wanders up. I use 100 grains of pyrodex p and a 250 grain shockwave. I checked the scope and everything is tight. I believe the problem is the scope but I am open to suggestions. One other thing it appears the verticle adjustment has to be moved more clicks than it should have to to bring the rifle back to zero. All my sighting in is done off a concrete bench and solid rest. All replies will be appreciated.

[Redhawk1]

Sounds like either two problems. Vertical stringing is due to powder charge inconsistencies or a bad scope. If you have another scope to put on your M/L, that is the first step I would try. If that does not correct the problem, weigh your powder to get consistency. I would weigh 10 charges by volume and get an average of the 10 and use that weight to use as a load. Hope this helps.  

[sabotloader]

TC4ME,

Before jumping on the scope I think I would check the forend of the rifle and the barrel channel itself.  In the old days when I was shooting high power center fire rifles your problem sounds like what I use to call "walking."  The barrel is pushing on the stock as it warms up and causes the impact point to move.  Does XR have a free floating barrel or is it tight in the channel?

Another possibility is your actual hold of the rifle - how far out on the forearm is the point where you are applying your holding pressure and how much pressure?  Some rifles are more sensitive to this pressure than others.  I try to place the front rest as far back on the forearm as I can.

Good luck in your search.....

[Lawful Larry]

Had the same problem and it turned out to be my scope.  I sent it back to the factory and they tried to blow me off.  I raised a little hell and complained that I had the scope mounted on my BP gun and it was not the idea that I had tightened he ring scews down too tight as they suggested.  They said they would check it out with the tech center and call me back.

They called back and apologized and said they would fix or give me a new scope.  Sometimes it helps to be a squeaky wheel.   :wink:

[mdc1]

I'm a little late reading this but if you haven't solved your problem yet check your forend screw.  I had one loosen up once on a rifle with very similar results.  Good luck.