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 A viable Mosin-Nagant rechamber?

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Zeiss Ikon



Posts : 135
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Join date : 2012-03-10
Age : 57
Location : North Carolina

PostSubject: A viable Mosin-Nagant rechamber?   Sat Jun 23, 2012 10:20 pm

I can't find the thread now (may not have been on this site), but a while back I saw a thread about rechambering Mosin-Nagant barrels to .303 British -- the consensus being that it wasn't very useful, because the .303 reamer won't "clean up" due to the more forward/steeper shoulder of the 7.62x54R chamber -- you'd have to set the barrel back to avoid having a double shoulder on fire-formed brass.

For those with more money than sense who like this kind of project, I may have spotted a chambering that beats this failing: .309 JDJ. This cartridge has a slightly smaller rim of identical thickness (though it's not heavily tapered like the x54R rim, which might require some attention to the extractor), a head diameter that, given where it was measured, should be only a couple thousandths smaller than that of the x54R, with a steeper, more forward shoulder, but effectively identical neck. Unlike many oddball cartridges, it can be reloaded with slightly shortened .30-06 Improved dies (standard item from Redding, at least), and brass can be made from .444 Marlin (likely requiring a couple steps to size down the neck -- possibly .416 Rigby, .35 Remington, and some 8 mm standard dies as intermediate steps -- and at least one or two annealings).

No, I don't think it's really a huge improvement over the 7.62x54R for a rifle, but some folks just like to have a wildcat and unless the overall cartridge length is a problem (shouldn't be; while the case is .119" longer, the Mosin-Nagant magazine was designed for the long round-nose bullets in use before WWI), this one wouldn't require any other modification to the Mosin-Nagant beyond the chamber and possibly extractor.
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