Re: Changing POI
Ok, after much testing here is what I have found out.
The equipment used for the test was a Remington 700 bluprented and Brux barrel with Nightforce rail the second gun is a Defiance action with a Lilja barrel and Seekins rail, 3 scopes, 2 Nightforce scopes one with Seekins rings the other with Nightforce rings and 1 Lupy MK4 with Badger rings. I removed the stcks from both guns and checked and torqued everything. I then took the 700 and clamped it in a barrel vise and mounted and torqued the first scope on it. I put the crosshairs on a 100 yard target and applied upward and downward pressure on the objective bell checking the movement after each time ( actually the sunshade so that gave a little more leverage) not a lot of pressure but firm. I watched as the scope would move its POA about .4" up and down. I repeated this with all 3 scopes on the first rifle and the results were all the same, so i'm thinging GUN right. Then I switched guns out and tested all 3 scopes on the Defiance and guess what, same POA change with all 3 scopes on the second gun. Now I'm saying SOB whats up now. I then took all 3 scopes (one at a time) with the rings mounted and clamped the rings in the vise of a milling machine, only the scope and rings nothing else. this setup is as stable as I can get. I pushed, pulled, twisted and yanked on the rings and turret trying to see any movement. The setup was rock solid I couldn't see any movement of the crosshair on the 100 yard target. I then took my hand and applied pressure to the objective bell and guess what, the crosshair would move up and down depending on the direction I pushed the bell (I would expect that because I'm flexing the tube) but they wouldn't go back to zero after I released the pressure, there was a .4" **** in POA the same that I was seeing when the scope was mounted on the gun. I repeated this with all 3 scopes and the results were just about the same for each scope. I think the tube is flexing and moving the internals and they aren't returning back to the same point, i'm sure the tube returns back. I dont think something is broken with all 3 scopes I think its a design limitation and just something to be aware of. Any thoughts on this, it would be nice if someone could try the same thing and confirm or disprove what I found.