Mosin new crown or counterbore?

gewehr76

gewehr76

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Hi everyone I need an advice.

I have a mosin 91/30 with nice bore but crown is worn, what are my options?
I can counterbore or there any other way to restore accuracy of the rifle? The wear of lands is not really deep, but enough to spray bullets all over the target.

Can counterbore be done with drill and drill bits?

Please let me know before I make a mistake.:redface:

Thank you
 
A brass lap with lapping compound can do wonders. How much of the muzzle would you need to remove?

gewehr76 said:
Hi everyone I need an advice.

I have a mosin 91/30 with nice bore but crown is worn, what are my options?
I can counterbore or there any other way to restore accuracy of the rifle? The wear of lands is not really deep, but enough to spray bullets all over the target.

Can counterbore be done with drill and drill bits?

Please let me know before I make a mistake.:redface:

Thank you
Click to expand...
 
gewehr76 said:
Hi everyone I need an advice.

I have a mosin 91/30 with nice bore but crown is worn, what are my options?
I can counterbore or there any other way to restore accuracy of the rifle? The wear of lands is not really deep, but enough to spray bullets all over the target.

Can counterbore be done with drill and drill bits?

Please let me know before I make a mistake.:redface:

Thank you
Click to expand...

Don't try and counterbore with a regular twist drill bit.
 
juanvaldez said:
A brass lap with lapping compound can do wonders. How much of the muzzle would you need to remove?
Click to expand...

Hello thanks for responding.

I need to remove may be 5 to 10 mm, I'm not sure may be less. If you know when you insert a 7.62x54r round in to the barrel bullet first there is about 5mm left towards the case of the cartridge. That's where I see the lands disappear. So I'm thinking this is the amount that I need to remove for this rifle to get accuracy back.:confused:

Any suggestion?
 
dont do it, seriously stop

You really don't want to do that. trying to cut into a hole like that with a drill is an outstanding way to wreck any part of the bore that the bit touches. I am a toolmaker, I cut metal for a living. Counterbores are cut on a lathe for a reason and they are cut with an endmill not a drill. If you really want to do this yourself, you need to cut the bad section of barrel off with a fine toothed hacksaw. then square the cut end and crown the bore with a brass panhead screw chucked in a hand drill with valve grinding compound as an abrasive.
 
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If you actually make the rifle better it will be good luck more than good planning. This is NOT the way to do it. You are far more likely to ruin the barrel than to make it in any way better than it is at present. This is not the sort of job to be done using hand held tools.
 
I took in a Mosin for a new crown in September. It cost 40 bucks and they removed less than an eighth of an inch. My groups went from 6 inches at 50 yards down to less than 1 inch, and about 2 1/2 inches at 100 yards with iron sights.
 
What diameter bullets are you using?
"...how much..." Epp's smithy starts at $75 to cut and crown a barrel. No price given for just re-doing the crown or counter-boring. Counter-boring will cost more due to the set up time required.
 
My barrel wasn't cut, just crowned. During the process , they took off/shaved an eighth of an inch. It cost 40 bucks
 
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