I recently mounted a scope on a new SPS-Tactical and had instant problems. Couldn't get enough elevation zero at 100 yards. Also noticed that the windage adjustment gave me some weird movement of the reticle.
First thought was "POS Scope". I centered the adjustments by rotating the scope in the mounts until I got no movement off aim point of the reticle. I also checked the mechanical center of the adjustments and found them to correlate with the "spin method".
When "bore sighting" while using a big spot on the side of a neighbors house 100 yards away (I hope they didn't look out and see the rifle pointed at them) the reticle was far above what it should have been for a "Zero MOA" rail mount.
Since I had a 20 MOA rail on the shelf I installed it and Bingo! The crosshairs were right on the bore-sight aim point at 100 yards.
Ideas of where the problem might be?
Bad Scope, although it doesn't appear to be malfunctioning. Adjustments yield nice precise movements of the reticle and they return to the same point when adjusted up/down or left/right the same number of MOA.
Bad scope rail (it was a rather inexpensive one from Blackhawk)
Improperly machined receiver??
Other??
Any suggestions or advice are welcome.
BTW, when I mounted my NF on the same setup it seems like I was all the way at one end of the elevation adjustment, again strange as the rail is a "Zero MOA".
First thought was "POS Scope". I centered the adjustments by rotating the scope in the mounts until I got no movement off aim point of the reticle. I also checked the mechanical center of the adjustments and found them to correlate with the "spin method".
When "bore sighting" while using a big spot on the side of a neighbors house 100 yards away (I hope they didn't look out and see the rifle pointed at them) the reticle was far above what it should have been for a "Zero MOA" rail mount.
Since I had a 20 MOA rail on the shelf I installed it and Bingo! The crosshairs were right on the bore-sight aim point at 100 yards.
Ideas of where the problem might be?
Bad Scope, although it doesn't appear to be malfunctioning. Adjustments yield nice precise movements of the reticle and they return to the same point when adjusted up/down or left/right the same number of MOA.
Bad scope rail (it was a rather inexpensive one from Blackhawk)
Improperly machined receiver??
Other??
Any suggestions or advice are welcome.
BTW, when I mounted my NF on the same setup it seems like I was all the way at one end of the elevation adjustment, again strange as the rail is a "Zero MOA".