I thought this would be interesting for the rest of you to know about. I am also interested to find out if any of you have had the same issue.
I have a 14" S&W 460 performance center with a crooked barrel. What I mean is that the barrel is cocked to the right in the frame.
I originally had a scope mounted on the integral weaver rail and noticed no issues other than difficulties dealing with a short eye relief.
Not long ago I bought a Wiegand "wieg-a-tinny" scope base and had it modified to fit the gun (unmodified it won't clear the integral rail). Once I had everything set up I found it impossible to zero my scope for windage. It was initially shooting 27 moa to the right! I lapped my rings and rechecked and remounted everything and the problem improved by only 3 moa.
I then decided to check things out with a set of scope levels and my scope was all level and mounted straight when checked with the gun mounted sideways in a vise. Then for the heck of it I decided to check the gun to see if it was level end-to-end. I discovered at that point that with the gun mounted right side up in the vise and the frame leveled that the barrel pointed upward (to the right side of the gun) very noticeably.
So go figure I have a bad gun. I got a shipping label from S&W today and sent it in with a note describing these issues.
The way I see it either the back of the barrel shroud isn't square, the front of the frame isn't square or the threads in the frame aren't square.
Has anyone else had this issue with their extended barrel 460?