Have had a summit for a few years, has been on a 30-06 and seen little use.

Put in on my .375 todsy, took it to the range, and when I was sighting it in, it would impact consistently left of point of aim. Began about 12 inches off and I dialed it until it was 2" to the left and then had no more room to adjust the scope.

I assume I've got a broken scope, but am hoping there is an operator error that I can correct as I'm heading to Africa in several weeks and had hoped to use the scope.

Thanks for any ideas.

If it had been doing fine on your other rifle and the problem began with the switch, I'd suspect ring/base alignment before anything else.

Yes, might need to shim the rings. There are quite a few rifles out there where the base screw holes are not aligned with the bore.

These are CZ rings on a BRNO 602. They clamp onto the receiver - higher probability of being out of alignment?

While you'll have to burn a couple rounds of ammo, the easiest way to know if it's a scope problem is to put it back on your other rifle exactly as before. If all is well, then you know it's not the scope.

I have had more issues with scope alignment problems and the need for shims on CZ rifles than all other makes and models combined.

It is very likely the alighned of the dovetails cut into the action or the barrel is not pointed in the same direiction as the centerline of the action.

Your origianl scope had more windage adjustment than the S&B and could correct for the alignment run out.

Google the amount of correction in each scope to give you an idea.

D'Arcy: What are your thoughts on using a bore sight to confirm or rule out a dovetail offset?
All my scopes (but one) that had been centered right in the middle of their adjustment range would always show the cross hairs somewhere within the graph.

I also use an older collimator to confirm windage and elevation run out. It has saved my bacon many, many times.

Not to long ago we set up quite a few Pre-64 Model 70's for a client that wanted all of them mounted with Swaro Z6's. I chose to use the older style Leupold/Redfield windage screw rear base mounts to allow for any misalignment issues.

It was a damn good thing we did or we would have run out of windage adjustment on two of those rifles.

quote:

Originally posted by DArcy_Echols_Co:
I also use an older collimator to confirm windage and elevation run out. It has saved my bacon many, many times.

Not to long ago we set up quite a few Pre-64 Model 70's for a client that wanted all of them mounted with Swaro Z6's. I chose to use the older style Leupold/Redfield windage screw rear base mounts to allow for any misalignment issues.

It was a damn good thing we did or we would have run out of windage adjustment on two of those rifles.

Yes, image-movement doesn't solve all the problems, just kids us to think it does - and leaves us with the bouncing mini-me.

I used Burris Zee rings with the concentric inserts to re-align a mostly windage off-set on a 98 Mauser. In hindsight a rookie mistake, overkill. Windage adjustable was the easy solution. Live and learn.

quote:

Originally posted by DArcy_Echols_Co:
I also use an older collimator to confirm windage and elevation run out. It has saved my bacon many, many times.

Not to long ago we set up quite a few Pre-64 Model 70's for a client that wanted all of them mounted with Swaro Z6's. I chose to use the older style Leupold/Redfield windage screw rear base mounts to allow for any misalignment issues.

It was a damn good thing we did or we would have run out of windage adjustment on two of those rifles.