scope shims

[ProCharger]

Bore sighting my rifle it seemed I had to use shims to get it on target. I had an error on my oart and didnt realize that when you bore sight everything is backwards......I was adjusting to the point where I was trying to move the crosshairs onto the POI when in fact i needed to move the POI to the crosshairs if that makes sense to ya. Well I realized I was going backwards and left the shims under the rear scope ring. At the range my groups were all over the place at 100 yards then I got out an alan wrench and tightened all the mounts a little. Would the shims be enough to cause the scope to move after firing a few times? The shims I used came in the scope ring box. Think I should dismount the scope and remove the shims since I probably do not need them? After tightening everything down I was getting 2MOA with 5 shots using a front rest only. Thanks in advance.

Brett

 

[kimbernut]

ProCharger

If everything is tightened down properly the shims should not make any difference. Personal preference, I would take them out if they are not needed. You are speaking of the thin metal shims used under the bases- Right?

 

[ProCharger]

No, these "shims" are a plastic/rubber material with a sticky backing on them. They may not be shims at all but this is what I perceived them as. They do not go under the base either, instead they go inside of the scope ring and make contact with the scope tube itself. The more I think about it the more I am thinking that these are more for protection on the scope tube from scratches when tightening down the scope ring, I just used them in an alternative method. When I opened the scope ring package these strips were inside of the rings with the wax paper backing on them so they would not stick to the rings themselves. Looks like a mistake on my part.

Brett

 

[kimbernut]

Protective tape

Ok. Whole different ball game. Just leave them in place and forget about them. They are as you say to help prevent scratches and clamp marks and to help prevent movement from recoil.

 

[ProCharger]

Thank you for your help...

Brett

 

[AZRickD]

I use epoxy.

FWIW, I did the same backwards thing with POI yesterday when I was sighting in a new scope. I vised the rifle, positioned the cross hairs on the holes in the paper 100 yards away and brought the crosshairs to the point of aim (moving it about 3" down and 1" to the left).

My next shot (oddly enough), was six inches high and two inches to the right.

It was a "D'oh" moment.

Rick

 

[kimbernut]

POI Adjustments

From what I understand and have experienced some scope brands adjust to what seems to be logical and proper and some brands adjust in the opposite direction. Anyone charted the different scope brands or models? Is the reason for this a difference in the number of lenses involved or what?

 

[ProCharger]

What I did wrong was I set the gun up for bore sighting and during the bore sighting I was looking at the point of impact of the bullet, then looking at the crosshairs. Well say I was 3-4" low, I would then try and lower the CROSSHAIRS instead of raising the point of impact. So on the scope I was turning clicks to lower the crosshairs to the point of impact but, by going lower on the scope tube that in fact raises the crosshairs but lowers the point of impact instead. Took me 20 minutes after remounting to the rifle to figure out what I was doing.