Re: I think I need some help
Wow, now I have to think you have something seriously wrong with the scope or the rifle. I am a bit surprised at the change in impact with a bullet change in the same weight, but only having 25 clicks or elevation really confuses me. .
Could be the bedding on the mount. That mount is stiff enough that even if you locked the front screw down solid and had a .015 gap at the rear I don't think you could distort the base. If you add material to the rear to bring it even, and then add material to the front later, you have in effect, reduced the taper in the mount. A 4" long 15moa tapered base will have .052" difference in rail height from front to back. If you added that much bedding then you would be where you would have been with a flat base. I doubt that you added that much material, but anything you can remove from the front will help. I would try removing the bedding from the front and see where the zero goes. I have to wonder if the action is true to the bore at this point, or if your scope is on the fritz. Please let me know what you find.
Oh, I have to ask - what did the groups look like, and did you see much variation when the rifle warmed up?
Also, if you want to mess around with this a bit more, you might try shimming the rear of the mount to see what it takes to get to use the full range of adjustment. How many cliks do you get from full up to full down?
A true ¼ inch click at 100 yards will be ½ at 300, ¾ at 300, etc. This is approximate, but it will be close enough to work.
Attitude is EVERYTHING!