If you suspect a bad scope--the answer

[bluechip]

We had a friend that consistently shot an odd group, two in one hole three in another so I made this scope tester. By aligning both POA's in the same spot, then knocking the block around in different directions and rechecking POA it is easy tell if the scope is faulty. One problem is if there is a discrepancy you won't know which scope has the issue until you have proven scopes to compare suspected ones by. I also can test the scopes tracking accuracy by aligning the two to the same point, then moving one scopes reticle a given amount and seeing if it moves the right amount by aiming at a yardstick at one hundred yards. Or move one a given amount, then return back to zero and see if the reticles are back to exact alignment.

 

[jackie schmidt]

That is similar to a Hood Scope Checker, except the Hood actually mounts on a rifle.

 

[Mike Bryant]

Charlie Hood made a similar set up for sale that would mount two scopes side by side on a benchrest rifle several years ago. Not hard to tell when you have a scope that moves. I had one scope that moved a ring every shot compared to the other scope. The bullets impact on target pretty well showed which scope was moving.

 

[ebb]

I had Col. Billy build me a 223 a few years back and it would show flashes of brilliance then nothing , all over the place. I tried every thing to no avail. My friend keep telling me it was the scope. Since it was brand new I refused to believe him. When I was ready to give up he produced the Hood scope checker. I could fire a shoot and the known good scope and the bullet hole would align but the suspect scope was not on the bullet hole most of the time. I had pictures of this scope checker on my rifle that I sent in with the scope when I returned it to be fixed/replaced. The manufacturer had no argument and replaced the scope promptly.

 

[Mike Bryant]

Nothing more frustrating than a scope that won't hold point of impact.