Author: RifleDude
Subject: Leica 3.5-14x42 ER Rifle Scope
Posted: September/21/2015 at 08:38
If you are running out of scope adjustment travel, the problem is almost always with either the ring heights being off front to back, or the top of the rifle receiver being out of spec (rear bridge step height relative to front receiver ring), or the mount screws out of alignment front to back. Even removing and replacing the same rings on the same rifle can change this situation, because the screw holes in the ring bases have enough clearance with the screws to allow variations in alignment and there is no precision locating feature to force the mount bases to the exact same spot on the receiver. Even very minor misalignment can cause problems with using up too much scope adjustment to zero. All of those things puts the scope tube in a bind and moves the scope center line off parallel from bore axis. These are not uncommon issues at all with mass produced rifles and scope rings, which is why people lap and bed scope rings and why Burris and a couple others use the self-aligning ring inserts in some of their rings.
Turn your scope adjustments all the way in one direction, then turn all the way in the opposite direction and count the number of clicks. Then adjust back to center again, counting clicks to confirm the reticle is centered. Run a tracking test to confirm that your point of impact moves in perfect linear relation to your adjustment direction and at the correct amount relative to adjustment. Then try to zero the scope and count the number of clicks you use. If you use up the exact same number of clicks to get the reticle centered, you run out of adjustment, and it still isn't centered, the problem is definitely with the scope mount/rifle receiver, not the scope.
If you're using the exact same rings you used with the Kahles and you never removed and reinstalled the rings when you mounted the Leica, the Kahles may simply have had more W/E adjustment travel, which would mask the problem.
Subject: Leica 3.5-14x42 ER Rifle Scope
Posted: September/21/2015 at 08:38
If you are running out of scope adjustment travel, the problem is almost always with either the ring heights being off front to back, or the top of the rifle receiver being out of spec (rear bridge step height relative to front receiver ring), or the mount screws out of alignment front to back. Even removing and replacing the same rings on the same rifle can change this situation, because the screw holes in the ring bases have enough clearance with the screws to allow variations in alignment and there is no precision locating feature to force the mount bases to the exact same spot on the receiver. Even very minor misalignment can cause problems with using up too much scope adjustment to zero. All of those things puts the scope tube in a bind and moves the scope center line off parallel from bore axis. These are not uncommon issues at all with mass produced rifles and scope rings, which is why people lap and bed scope rings and why Burris and a couple others use the self-aligning ring inserts in some of their rings.
Turn your scope adjustments all the way in one direction, then turn all the way in the opposite direction and count the number of clicks. Then adjust back to center again, counting clicks to confirm the reticle is centered. Run a tracking test to confirm that your point of impact moves in perfect linear relation to your adjustment direction and at the correct amount relative to adjustment. Then try to zero the scope and count the number of clicks you use. If you use up the exact same number of clicks to get the reticle centered, you run out of adjustment, and it still isn't centered, the problem is definitely with the scope mount/rifle receiver, not the scope.
If you're using the exact same rings you used with the Kahles and you never removed and reinstalled the rings when you mounted the Leica, the Kahles may simply have had more W/E adjustment travel, which would mask the problem.