460 XVR Scope Mount Problem

BeauW

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Hello everyone. I'm a noobie to this forum (well, actually I've looked at it in the past without signing up). That said. I am a lover of S&W and have several...k frames, N frames and now, I've added an X frame...a Smith 460. One of the things that floated my boat was the expectation of scoping this puppy. Now for the problem. After purchasing the gun, I also purchased a Warne base and rings as well as a Nikon 2-8 pistol scope. When installing the base, I noticed that the front of the base would move slightly to the right when tightening the screws. I especially took note of this after putting my Laserlyte bore sight on it and it was out 2-3" left and maybe 3" low at just 12 ft! (across my living room). Even when the scope was adjusted to it's extreme it was slightly out. I tried this at the range as well but was off a few inches at 7 yds!!!... And that at extreme adjustment!!! I talked to a tech at Warne who sent me another base to try on the chance that the base was out...even though he said it would have been an exceptionally rare occurrence. Sighting was out with this base as well. It too, had the front or the base move slightly right when tightening it. BTW, this is the multi-sight base where you attach the rear sight you removed from the frame to to the base. I took note that the iron sights when mounted on the Warne base were out as well (so it isn't a rings problem). After some back and forth discussion, the Tech suggested I talk to S&W as they have, on rare occurrence, encountered an X-frame that had been hand polished a bit much on one side or the other on the the top strap and that could cause the problem I described. OK, fine. So I contacted S&W and they asked me to send the gun to them. I was surprised that they actually replaced the entire frame! Thinking the situation resolved, I was excited to receive my firearm back. However, I tried to mount the Warne base and mount to the new frame...SURPRISE!!! Same issue!! A couple weeks ago, I called Warne back once again and spoke to the same Tech I spoke to previously. After some back and forth, he asked me to send him my base. He saw nothing really wrong with it, but sent me ANOTHER new base. I just tried this once again this evening, and the same issue has occurred. Now one would think that given the issue I had to begin with, if S&W replaces the entire frame, that they would be sure the new frame isn't over hand polished on one side or the other. Furthermore, I know of 2 other people who have smith 500's and neither have had this problem. and, of course, the 500 and 460 are built on the same frames. Everything screwed right up for those guys...one with a Warne mount, the other with a Weigand Mount. They had pretty minimal sight-in to do after bore sighting even. So, does anybody have any thoughts on my problem? I did call S&W back to see what they say. I have also considered bedding the Warne base to the top strap to prevent the 'twist' to the right when I do the last 1/4 - 1/2 turn to tighten the scope base screws. The Warne Tech suggested I use bedding putty rather than a thinner compund if I do decide on using bedding compound. However, it seems to me that a new gun that is supposed to take a 'drop-in' mount should be able to do just that. Oh, one more thing, I can get the thing to shoot using just the iron sights mounted to the top strap...as it came from the factory, but I really bought it to scope it.
I'd like any input/insight anyone here may have. Looking forward to your responses!
 
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More on The 460 XVR Scope Mount Problem

I have the 8-3/8" barrel. It is NOT the performance center model. I specifically avoided the Performance Center Model because I couldn't get an 8-3/8 barrel. The pre drilled area is, of course on the top strap with the actual screw holes under the rear sight. The screws line up perfect. It's the last 1/2 or 3/4 turn causes the front of the mount (toward the barrel) to shift very slightly to the right...maybe a millimeter or so. Very slight, but enough to make the mount off by many inches over 25 or so yards...and I'm hoping to be able to get decent groups out to 100 or more yards
 
You have something not lining up correctly or a screw binding by the sounds of it. The base should sit flat and the holes line up correctly before inserting the screws. If the base and top strap holes line up make sure the screws or screw heads are not binding on the base holes.
 
Can u shim it ?

Maybe I could shim it. I considered using bedding putty to bed it. That was a suggestion by the Tech at Warne. I'm also considering send the d*% thing to S&W and let them mount the scope. I don't know anyone with a 460, but I do know 2 guys who have Smith 500's...same gun, frame everything...except caliber. Neither of them had any problem whatsoever.:confused:
 
You have something not lining up correctly or a screw binding by the sounds of it. The base should sit flat and the holes line up correctly before inserting the screws. If the base and top strap holes line up make sure the screws or screw heads are not binding on the base holes.
I've had 3 different bases from Warne...all had the same issue. They sent me a second base to try with the gun to begin with. When I sent the gun to S&W, they must have thought there was some issue with the gun as they replaced the frame. However, I'm having the same issue with this frame. Warne did have me send them my base and screws to examine...they didn't see any issue, but sent me a brand new base and screws just in case. Still the same issue. Now Smith tells me it's unlikely it's their gun and I should try another brand of scope mount!!
 
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Are you expecting the scope to line up by just bolting it on the gun?
Have you adjusted the reticle after mounting and shooting and run out of adjustment?
 
Your post prompted me to quit lurking and register to the S&W forum.

I also have an 460 XVR. I have a Leupold FXII scope mounted with Lupy mount and rings. Since S&W replaced your frame, I would see if a different mount will line up with out any screws. The screws should not "pull" the mount into the frame, it should sit over the frame holes with perfect alignment.

Hope this helps and good luck.

Jim
 
Are you expecting the scope to line up by just bolting it on the gun?
Have you adjusted the reticle after mounting and shooting and run out of adjustment?



No, I am not. FYI, I have mounted many scopes to my guns in the past with no issues. I am experienced enough at sighting guns that I have occasionally helped out my gun club on public sight-0in days. When I mount the base to the gun and then the rings and scope, I have to run the adjustments all the way to bring the point of aim to within 2 or 3 inches at 12 ft!! (As per my bore sight). At one point I thought the laser boresight might have a problem, but I checked it with other firearms I know are sighted in and it's fine. I also tried shooting the gun at 7 yds at a target at my home range and it just prints paper...bullets holes several inches left and 3 or 4 inches low at extreme left adjustment!! I have not messed with elevation yet. When watching closely, I can see the mount begin to sift slightly as I begin torque the screws down (torque screw driver at 25 in-lbs as per Warne). The whole thing shifts perhaps a millimeter of less...but that makes for inches at distances even just across the living room (~12 ft). I haven't followed up with anything else for a few days as I have been busy with a plumbing failure at home.
 
Your post prompted me to quit lurking and register to the S&W forum.

I also have an 460 XVR. I have a Leupold FXII scope mounted with Lupy mount and rings. Since S&W replaced your frame, I would see if a different mount will line up with out any screws. The screws should not "pull" the mount into the frame, it should sit over the frame holes with perfect alignment.

Hope this helps and good luck.

Jim

I agree with you Jim. I would be more inclined to blame the mount if Warne had not supplied 2 more mounts. I have Warne mounts on a couple other guns and they screwed right up and I have a friend with them on a Smith 500...again no problems.

Oh, by the way...I was a long-time luker, myself, until this problem arose! Thanks, Jim, for your response!
 
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