I put my 4-16x50 pentax gameseeker on my 30-06. The rifle is an Interarms Mark X.

With the scope at max right setting the bullet still hits 6" to the left at 25 yards. Scope seems to be seated nicely as it does group the shots but they are way left and I am out of adjustment.

The mounts are weaver style bases with Weaver quad lock mounts.

Any suggestions.

Just to be clear, your rifle is grouping 6" left at 25 yards with a max windage adjustment. So if you set it back to zero/zero you would be off target to the right.

Step one. Set the gun in a rested position, pull the bolt and align the bore onto a target at 50 to 100 yards by eyeing through the bore only.

Step two. Without touching the rifle, glance through the scope and see where the cross hare is in comparison.

a. The bore and cross hair should be on the same target with the scope set on zero/zero

b. Try to make as many adjustments to the base and rings as possible before using the scope.


Looking for problems.

Step one. Check the scope alignment to the barrel.

Step two. Check the base and ring alignment ensuring that they are not off.

Th scope being off as much as you say would show in the external alignment but if it is straight then it must be inside the scope.

I am not familiar with the Quad Lock, but it appears from the photos I see on the internet that they are not windage adjustable.

My guess is that the holes in your receiver are not inline with your bore. I can think of two easy solutions:

1 Go to windage adjustable bases (standard Leupold come to mind)

2 Use Burris Signature Z rings where you can purchase nylon eccentric inserts to adjust POI. You would still use your Weaver bases.

I used the Signature rings on a rifle where the holes and bore did not align, and they worked very well.

405wcf

It was hitting about 4 feet left at 100 yards before I adjusted to max.

The rings and bases are not adjustable.

I will check out the Signature rings.

Yeah, the signature rings are a good way to go. they have varying degrees of offset inserts you can buy.

Did you try another scope, just to make sure it is indeed the rings/bases? Never know...

This was the first time shooting this rifle so I havent tried other scopes on it.

I had a POS ruger #1 that that same problem. I finally concluded the bridge on top was crooked.

1st thing to do is to reverse either of the rings. that was you can see if the problem is in the rings or not i.e. if a ring is out of alignment, by reversing one or the other it will shift impact back the opposite way

quote:

Originally posted by butchloc:
1st thing to do is to reverse either of the rings. that was you can see if the problem is in the rings or not i.e. if a ring is out of alignment, by reversing one or the other it will shift impact back the opposite way

What he says.

Change the front ring first & if that doesn't work, reverse the rear one.
A mate of mine had the same issue with a scope on an AR15 which was fixed by doing just that.

I reversed both rings and it was still obvious it was crooked. The front and rear holes in the receiver line up with each other but vear off to the right. I have some weaver grand slam rings that are windage adjustable and put them on the rifle both adjusted to max each way. To the left for the front one and to the right for the rear one. The scope now looks like it is pointing the right way. Just have to try it out now.

Unfortunatly the scope I got for it wont fit my medium Grand Slam rings. So its back on with the old Tasco.

You may want to try only reversing one of the rings.

If it's off that far, then the rings will need honed to avoid pinching the scope tube.

I have a Interarms Mark X with Leupolds mounts rear base is cranked right across for widage due to this issue!

Rifle is a great shooter and has served me well for nearly 30 years

The Mark X's were pretty rough the way they came from the factory. All production rifle/mount/rings have combinations have soem degree of crookedness, and the Mk X led the head of the pack. Mi ne is no exception to this fact!

As for fixes, in order of ascending cost:

1. keep swapping ring and base ciombinations to see what it does. These ring/base combos have alignment issues as well, though typically not as severe as the Mk X issues I have seen and worked on. If you have a gunsmith nearby, see if he will let you swap some rings and bases in the hopes it gets better.

HOWEVER-this method, assuming you are lucky enough to find a ring and base combo that is equally as bad as your drilled and tapped holes, will in all likelihood resquire your scope to be fully adjusted to the left. Scopes are happiest when they are in the center of their adjustment range.

2. the afore mention of windage adjustable rings. However-the older I get the more I dislike this system beased on many years of working on guns. They are definitely weaker/less rugged than most ring/base combos, such as your Weaver system.

3. Burris Signature rings and bases. I have used these several times and really like them. I would not get a set that is based on the Redfield system with the windage adjustable rear base mentioned above. these rings are great, can keep a firm grip on the scope during recoil, and they do this without leaving ring marks on scope.

4. have a good gunsmith look at it and see if he can fairly easily drill and tap for 8x40 screws and then get bases that are set up for that screw.

5. Have custom bases made. Works perfeccly, but it can get expensive in a hurry.

I would make a set of custom mounts, and mill the blocks to shape on the action set on a milling fixture. This would provide an accurate centerline for the scope mounting surfaces.

quote:

Any suggestions.

OR .....

quote:

have a good gunsmith look at it and see if he can fairly easily drill and tap for 8x40 screws and then get bases that are set up for that screw.

My sentiments exactly. Re-drill (over size) the Base Holes to (somewhere) in the centerline of the action.

I had this done to a Savage that had the holes drilled so off-center that no amount of scope adjustment would compensate.
Good Luck

Food for thought ......

Agreed. You are always better off with the bigger screws on anything bigger than a 22 centerfire IMHO

quote:

Originally posted by RMiller:
I put my 4-16x50 pentax gameseeker on my 30-06. The rifle is an Interarms Mark X.

With the scope at max right setting the bullet still hits 6" to the left at 25 yards. Scope seems to be seated nicely as it does group the shots but they are way left and I am out of adjustment.

The mounts are weaver style bases with Weaver quad lock mounts.

Any suggestions.

I ran into the same problem today mounting a scope with a weaver style rings, don't know the name brand, but they have a lock screw on each side of the rings, two per ring. I was off 6" to the right at 20'< I loosened the lock screws and centered the rings and retightened the lock screws,problem solved. If you can find this style of rings I'm sure it will solve your problem. Again , a weaver style ring with lock screws on eash side of the ring, tighted one more then the other and the ring is offcenter. This will give you all the adjustment you could ever need, center the rings and scope adjustments first, then adjust the rings to get you close to center then adjust the scope.

I too had what I thought were similiar issues with a M-70. I too went through the Burris Sig. Zee rings with the inserts which were fine at first. Then I had a custom barrel installed I found that even with the inserts were at the tail end of windage adjustment. Then I took the rifle to a very competant gunsmith at Canyon Lake, Texas. He looked down the bases and saw the obvious. The top of the of the receiver was milled down more on one side than the other. I completely missed this when I aligned the rings This made the bases out of plane with each other. In other words one base was leaning over from the other. The holes were actually drilled in true alignment. (he had seen this before on another make of rifle)
Check your bases by eye and straight edge. You might have the same issue.