I have a Bushnell Elite 4200 8-32x40 put on Tikka M595 Sporter using millet high mounts.

Today i was trying bore sighting at home against a 2x2" red dot atached to the fence at 25 yards.
When I got that red dot in my bore and then try to navigate with a rings to place the cros on the same spot, there was not enough clicks. I came about 1" short to the left and low.

What I do wrong?
In my little manual from Bushnell is says to shimm mount base, but how, can you help me, please.

Peter

I don't know what power your scope is set to, but even at 8x (the lowest choice on your scope) a 2"x2" dot at 25 yds. is going to appear huge, which makes boresighting rather difficult, especially with HIGH mounts. In fact, you would probably be well-served by replacing the high rings with mediums. The closer you get the scope's line-of-sight to the rifle's line-of-bore, the better.

Before getting into shimming, etc., put your dot out at 75 or 100 yards and try again. I bet you'll be fine.

Good luck,
RSY

To fix it right you may have to surface grind the receiver..Remember you want the gun to bore sight with the adjustments in the center of the scope focal plane...then perhaps its the mounts but I doubt it..off ground factory rifles are fairly common according to Dave Talley and others .....

To begin with try a few shots first on a big piece of paper at approx 35 yards. Make sure you are not dealing with human error to begin with.



If it is still off as you say then a number of things can be the problem and they may be and can be solved without surface grinding the action, but for God's sake do not jump onto that solution without some more exploring . If it is off the target after you shoot and you can not get it adjusted onto the target with some latitude inyour adjustment both laterally and vertically first try a different scope, particularly if this scope is new. I have seen a Zeiss that you could not adjust just as yours but every other scope would work. If that is the case send the scope in.



If all scopes act the same you may have some problems with a number of things but the most likely is the where the holes are drilled and tapped and or possible differences in either the bases or the action. If the rifle is new and you determine that it is the rifle, send it back. If it is beyond warranty you can shim the back to get the point of impact up and you can use a set of windage adjustable rear bases to get the scope where it should be. It is preferable to have the scope with equal adjustments in windage and elevation and be centered on a 100 yard target but it is not totally necessary. Bushnell makes some rings that compensate well for small differences in ring placement and they would be advisable although I can not remember the name of them. Good luck.



PS, with this being that far out of wack at 25 yards, I will be very surprised if it is not the scope. Wouldn't be the first time I was surprised though. One simple visual check. Eyeball the alignment of the scope relative to the barrel. With that much out of whack, it should be visible.

Some things come to mind.

Do try it farther away.

Do shoot it before you shim it.

Tap the scope with a screwdriver handle to be sure the guts are not gummed with grease. Do this when ever you ajust it. Your Bushnell scope is suspect form the get go. Why not just bite the bullet and get a Leupold or other better scope?

If you really have to shim it, here is the bubba way that has never failed me. Use aluminum can metal. Cut pieces that fit under the bases and don't stick out. Use a hole punch for paper to cut out for the screws. If you need to move side to side make a shim that is folded to give double thickness on one side or insert little strips to cant the rings. Once it bore sights take it all off and epoxy the shims to the rifle and bases.

I know some will say this will cause problems because the rings are not perfectly aligned with the scope tube but, it never gave me any problems. I have done this many times with Weaver bases and rings.

A better solution is to get a Redfield one piece base. This keeps everything straight. Just shim for up and down and use the screws for horizontal.

I mounted hundreds of scopes when I worked for a gunshop and never re ground a receiver. This may be optimal but is not necessary.

I would try some low or medium rings with a 40 mm bell, I really see no need for using the high rings.

Peter:



Quick procedural check: you do realize that when boresighting you have to turn the adjustment knobs in the opposite direction from what you would when adjusting during actual shooting?



Hopefully, your problem is this simple.



Good luck,

RSY

One more thought...if those are Angle-Loc rings they may be not be properly centered on the mounts.

If your rings and bases are actually out of alignment, try the Burris Signature rings. They have inserts that fit inside their rings so you can adjust each up and down or left and right. They will mount the scope stress free.



Hart



As an after thought, Burris may not make the above rings for a Tikka.

You have had some good suggestions so far, but one that hasn't been made is custom bases. IMO, if all else fails, you would be better served to put custom bases on your factory blued receiver, than to surface grind and reblue. Last year, Mark Stratton made bases for one of my Model 70's that had been drilled off-center. I mounted a new Leupold scope and without collimating or adjusting the scope, it printed the first five shot group 2" high and (barely) 1/2" left @ 100 yds.