Martini

I

Ian_Owen

Member
While not benchrest I need some help figuring this out and some suggestions on how to fix the problem.

I just pulled the barrel from a Martini model 12 and found that the barrel shoulder has only been touching on 1/3 of it. This tells me that something isn't square, either the action face or the action threads.

Now a bolt action is easy to setup to recut threads square with the bolt, but with the Martini.....what do you line it up with?? and how do you check which is not true??

Ian Owen
 
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It's a Martini - it doesn't really matter... ;)

You can make a stub that threads in and shoulders against the action just like the barrel does. The center of this stub can first be bored to an exact size absolutely square with the shoulder of the stub. A lap can be made to fit this bored hole and the bolt face can be lapped to see how square the bolt face is to the barrel. That's all I have ever done to them.
 
Action Threads and Face

The threads and face are obviously not square with each other. If your only concern is getting the reciever square, here is how I would do it.

Chuck up a piece of steel larger than the thread. Now, here is where you have to be careful. Thread the piece a little shorter than a barrel tenon untill you can just barely screw the action onto it. You are aiming for as little slack as possible. Let it tighten up where the thread ends.

You can then take a tool and face the action face.

This will change the headspace, depending on how much you have to take off. But, as Dennis said, that is no guarantee that the threads and face are square with everything else.......jackie
 
Dennis.......you could be right, but only accurate guns are interesting so I may as well "try" and make it as accurate as it can be.

Thanks Dennis and Jackie, I will check and see how square the breech block is to the tenon threads.

Dennis, how much have you had to take off the face of a breech block to get it square with the barrel tenon?

Ian
 
Ian_Owen said:
Dennis.......you could be right, but only accurate guns are interesting so I may as well "try" and make it as accurate as it can be.

Thanks Dennis and Jackie, I will check and see how square the breech block is to the tenon threads.

Dennis, how much have you had to take off the face of a breech block to get it square with the barrel tenon?

Ian
Click to expand...

Hardly anything ... I just lapped where the case head sits on a locked bolt. It doesn't really matter about the rest of the boltface.
 
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