Re: Mosin Nagant 1891/30 sniper scope mounting ??
I mounted it myself probably over a year ago. I sweated bullet doing it and I would not do it again!
Here's the problem: my M-N has a hexagonal receiver and I chose to mount the over the barrel mount..... big mistake! The flats of the receiver are not parallel to the bore of the barrel. I found that out after affixing the mount to the receiver. The drilling and tapping was a big deal too as the receiver did not drill nicely or tap easily as it is pretty hard. I had to make offset shims for the scope to sit in to get its optical center in line with the bore of the barrel. The scope adjustment would not do the job...these are pretty crude scopes. I got it done and it works. I should have chosen the side mount (if you can even put it on the hex barrel ??? I forget now if you can but I think you can???).
The scope was a problem too as the focus was adjusted wrong and was only sharp at about 25 feet. It went back and the supplier adjusted it and sent it back (an internal adjustment). Its fine now.
I mounted the side mount on my son-in-laws round receiver M-N gun after a Surplus Arms dealer attempted to do it and screwed it up. The holes end up in a better place but the metal is still hard to drill and tap. That mount can be adjusted to accommodate any optical to bore misalignment...a much better setup but it puts you along side the stock instead of on top of it.
My son-in-law has since found a machinist who understands that the receiver is not necessarily parallel to the bore and sets up the holes to account for that error. It is not all that expensive and there are several others who do it (correctly). I would never do it again myself. Destroying a perfectly good M-N is not my idea of fun regardless that they are not that expensive.
Mine shoots much better than I expected with the scope and rivals scoped Mausers for accuracy, in my opinion and in in-prompt-to testing my son-in-law and I did.