358 mosin nagant

[Oklahoma Rebel]

I have been thinking about converting my mosin nagant to 358 cal. I would be using the original cases just necking them up, I have heard of 9x56 or 57, is that what it is? also I would be shortening the barrel to maybe 24" ( it is a 91/30), since that would cut the thinner walled part of the barrel out could it just be bored out or is this a new barrel situation. if I will need to replace the barrel how expensive/extensive of a job is it, I know it would be a gunsmith job. alright thanks a lot, Travis

[Kegcaissy]

interesting

[Artful]

I'd call J.E.S. and see what the charges would be - 9x54R sound right good to me.

[Outpost75]

The 9.3 and 9.5x54R are both loaded as sporting cartridges in Russia and Finland. A .358/9mm would be a useful cartridge too and would be a straight-forward rebore. It would require some magazine work for the larger case neck to pass through the cartridge guides

[Jniedbalski]

That would be also a great cast shooter

[Josh Smith]

Tag!

The 9.x x 54r are interesting. I'd like to see someone here build it.

Regards,

Josh

[pworley1]

Keep us updated on this project as you go forward.

[nagantguy]

sounds like a worthwhile project , please keep us posted, as often as I've thought of converting one to something else everytime l pull the trigger I smile and remember how much the original round intrests me.

[Texas by God]

Do it. There's a billion Mosins out there. Might as well have a unique one! Best, Thomas.

[Oklahoma Rebel]

I was thinking, that if I were to do it that .338 would be better, and I could still get a 250 gr boolit moulds for it, I think that's about as heavy as 338s go, and as outpost mentioned about the magazine, the 338, I doubt, would need modification. I have looked in my mag while it was loaded and it seems to have enough extra room. and 338 boolits have great sectional density. I am planning on shortening the 29 inch barrel down to 24, so that would get rid of the thinnest part.do you guys think I could have my barrel bored out or would that make the walls to thin? id rather not buy a new barrel

[Oklahoma Rebel]

Outpost, you think that it could be bored to .358 safely?

[Artful]

The 9.3 and 9.5x54R are both loaded as sporting cartridges in Russia and Finland. A .358/9mm would be a useful cartridge too and would be a straight-forward rebore. It would require some magazine work for the larger case neck to pass through the cartridge guides

Hmmm - you mean the
9x53R in Russia
https://en.wikipedia.org/wiki/9%C3%9753mmR
and the Finnish
9,3x53R and the 8,2x53R.
Both of which came about after WW2 when it became law that you have to use rifle over 8mm bore for moose hunting.
This law fell late -60´s. It was designed to conserve military type Ammo and Arms.

Mosin Actions are quite strong
First attempts to destroy it.
https://www.youtube.com/watch?v=gfiXFyIbOZw
2nd attempt after it passed a full case of 2400 magnum pistol powder
failed to destroy it.

[Tackleberry41]

I wonder if a rebore to something larger would prevent the need for a barrel. I have a war production mosin, it will shoot, but you really have to push the bullets out to get to the throat. What does something like a rebore cost?

[Texas by God]

If JES will do it it will be $250 or so and worth it. Much less than rebarreling. Best, Thomas.

[Smoke4320]

Very interesting idea.
Keep us posted
I believe a call to JES reboring in Oregon is a good move

[Mk42gunner]

There was an article in one of the gun digest type books several years ago that was about the various calibers wildcatted from the 7.62x54R. IIRC it went from .22 to .45, with stops at most metric sizes and a straight walled shot shell that gave .410-ish results.

A .358x54R sounds easily doable to me. Widening the front of the magazine wouldn't be that hard either.

Robert

[wiljen]

On the comment "I'd rather not buy a new barrel", Have you by chance priced a rebore lately? It may actually be more cost effective to replace the barrel than to rebore it. Last time I checked I could buy a shilen or douglas air guaged blank for less than having labounty's successor rebore an existing tube. If it were an old lever or something where I wanted to keep the markings period correct, I'd probably bore it. For a 91/30 at $79 each, I dont think that same concern applies.

[Tackleberry41]

Cant see paying $250 to rebore a rifle I paid $100 for. I guess it costs more to pay someone for a rebarrel. I have a lathe so just be the cost of a blank and rent a reamer. I have 2 Mosins in need of a barrel, was thinkin do one in 308 for a wider selection of bullets.

[Texas by God]

Finding a 'smith willing to rebarrel a Mosin(especially a round receiver) probably won' t be easy. Three words: JES, JES, JES. Best, Thomas.

[Hamish]

Guys keep posting JES, but it has been my understanding that he has refused to do milsurps for some time, and have seen it posted many times on this forum in the last year.