Re barreling a Mosin Nagant

Screach

Sergeant of the Hide
Apr 19, 2017
14
0
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20
Portland, OR
#1
Hey guys I recently came across the opportunity to re-barrel a Mosin Nagant. Mcgowen offers several mosin contours and will also custom thread barrels to mosin action specs. Has anyone done this? If so what has been your experience with it. They are charging $375 I think for a threaded and contoured barrel that only needs the extractor groove cut and to be timed onto the action. I ran across the gibbs m1903 and though it might be cool to have a 1/2 moa mosin... :p

Feel free to add your questions or comments. Would be fun to go to a prs match with a mosin...
 

Ledzep

Chancellor
Jun 9, 2009
1,312
145
63
Black Hills
#2
I've thought to do it myself, maybe a .308x54r. The bummer is scope mounting options. It takes some doing and I think you still end up with a chin weld like my 91/30 PU sniper.
 

Greg Langelius *

Resident Elder Fart
Aug 10, 2001
5,046
439
83
Arizona, good place for me...
#3
After many years of bangin' my head against the 91/30, I have a deep respect for letting sleeping dogs lie. The first rule of thumb about them is that they are most excellent when being asked to do what they were designed for. Even as a sniper weapon, it was never match-accurate.

The scope was really more of a means to refine the zero than to deliver stellar accuracy.

The most lasting lesson is that it costs more than is wise to achieve anything more than conscripts mass musketry-level accuracy. You'll be putting a $300 barrel on a rifle that was never even worth as much as I paid for my first one, $119, and way overpriced at that, even back then.

If you want an accurate X54R, put the $300 toward a Finn M-39.

Greg

PS, OK, I'll still bite.

When you put on the new barrel, it's probably going to end up deleting the rear sight mount. I found that by removing the rear sight, and mounting Airgun Rings directly to the dovetail, a low and rugged sight mounting was possible, but you would be limited to using a Long Eye Relief scope. Not terrible, I have a Bushnell pistol scope on mine and it's quite usable as well as being the most solid mount I've yet to see for the 91/30. I insist on the Scout mounting position because I am fiercely committed to preserving the stripper clip feeding function. An over-the-action scope mounting would eliminate that. But I also have an Archangel Stock on mine. It's very well inletted, and employs a ten round DM that works, period. I like it more for the capacity than for the detachability. I can still use the Stripper clip feeding feature, but I now have a capacity for two clips worth of ready ammunition. I think that the better approach with the barrel is to crop about 4" and recrown. Once you get rid of that excess length and high potential for a ruined crown from cleaning rod wear, I think that more decent accuracy will be enabled.

As a handloading solution I'd try the HDY "303 caliber" 150gr Interlock, and around 50gr of Varget. The 91/30 action is pretty rugged, and max loads may (or may not be) more about preserving brass life than about finding an overpressure limit. 50.5gr of Varget is the 150gr limit according to the Hodgdon site, and I'd be working up to that and being supremely cautious with reading pressure signs above 49.0gr. All that cheap military 150gr surplus ammo has a special additional pricetag in the form of corrosive priming; one MUST clean it with a reliable corrosive priming remover ASAP after firing.
 
Last edited:
Dec 7, 2013
4
1
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Ohio
#4
Hey guys I recently came across the opportunity to re-barrel a Mosin Nagant. Mcgowen offers several mosin contours and will also custom thread barrels to mosin action specs. Has anyone done this? If so what has been your experience with it. They are charging $375 I think for a threaded and contoured barrel that only needs the extractor groove cut and to be timed onto the action. I ran across the gibbs m1903 and though it might be cool to have a 1/2 moa mosin... :p

Feel free to add your questions or comments. Would be fun to go to a prs match with a mosin...
Screach,
Yep it has been done and there are several ways... Mcgowen is the only prefit that I know of but even then you still need a smith that knows his way around a MoNa and has done one before. Many use Green Mountain AK blanks and get the smith to ream and finish them up. I had a Shilen match barrel made for my MoNa build. It is not the simple smith job compared to other rifle routes and you can put some money into it depending on what you are trying to do. But if done right they can be sub MOA. My best 5 shot grouping has been .2" and it is easily 1/4-12 sub moa. I run a couple FB groups and know folks that can do serious mods. It got me into the rifle game and was a great learning step and I now play in all calibers these days, but my best Bench Rifle is my BSA MoNa and I got some looks the first time I pulled it out for my range matches for the year. There are 2 groups on FB I would suggest Mosin Modders and mine Mosin Nagant Mad Hatter Modders. Good luck and find me on FB and I'd be glad to point you to leads you need.
Randall
 

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