Counter bored?

[.45&TKD]

I've heard that some of the Mosin Nagant's for sale have been counter bored.

What is counter boring exactly?

Is there a way to tell if a rifle has been counter bored?

Is it a bad thing to have?

 

[Erik Jensen]

basically, as I understand it, they bore out the muzzle a little bigger than the rest of the barrel, to correct for severe muzzle erosion. I guess you could say that the counter-sink the barrel back to where the rifling is still good. should be easy to tell whether it's been done, and shouldn't effect accuracy much, so far as I can tell.

 

[Art Eatman]

I guess that would restore shootability without messing up the dimensions for mounting a bayonet...And would leave the front sight in place.

Art

 

[Stinger]

It could be a good thing, or it could be a bad thing, you just never know until you try.

So try and give us a report of your findings.

YMMV,

Stinger

 

[Kamicosmos]

What is counter boring exactly?

When you start telling a boring story to the guy telling you a boring story to make him stop.


Sorry, quirky mood tonight.

 

[Archie]

Beretta and Art have it correct.

The idea is to cut away the worn out rifling at the muzzle. If the worn out rifling was what was causing inaccuracy, and the counter boring is done correctly, accuracy is ENHANCED.

If the rifle has other problems, bad bedding, lopsided chamber, bad trigger; or if the counterboring is botched, accuracy will be not so encouraging.

 

[Illuminate]

I just found out my M-N I bought is counterbored. I don't see how it would be any different than having a muzzle break or some other doodad mounted on the end of your barrel that has no rifling. You just get a >wee< bit lower velocity, and whoever made the rifles saved a few bucks on a new barrel.