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30-30 mosin nagant question.
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  theloner

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Posted: July 24 2016 at 6:56am | IP Logged Quote theloner

I have a project that started out as a mosin nagant action with a springfeild 30-06 barrel fitted up to it, the threads were cut off first before rethreading. It remains unchambered. The intent is to rechamber to 30-30.

My question is what would be the best method to modify the bolt head to fit the smaller 30-30 rim? any thoughts?

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  backbencher

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Posted: July 24 2016 at 3:56pm | IP Logged Quote backbencher

Bet all you'd have to modify would be the extractor, and perhaps the magazine follower.
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  theloner

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Posted: July 25 2016 at 6:12am | IP Logged Quote theloner

thanks for the reply, it certainly is close
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  beesfarm

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Posted: August 06 2016 at 7:03pm | IP Logged Quote beesfarm

 30 30 winchester bullet dia.is .308 and 7.62x54r bullet dia. is .312.
 probably sacrifice accuracy.
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  northumbrian

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Posted: August 07 2016 at 2:40am | IP Logged Quote northumbrian

Unfortunately, not really close enough.

You'd have to either add material to the breech face and then re-cut the face.
Or
Swage the bolt face cup in with a resizing die.

Either way the extractor will need reworking.

Mag follower, due to the very different dimensional constraints of each cartridge, you're going to get feeding problems.
The interrupter may or may not work, and will most likely need some fiddling to hold the rounds in the mag.
Ejector, again may or may not work, and mostly will require a new one made up, with a slightly longer ejector to take up the difference in rim diameters.

The other alternative, is to rechamber in the Finn 7.62x53r, which used a .308 bullet.
This would require the least amount of work, and only require the chamber reaming for 7.62x53r.
Of course would mean you can't use surplus 54r, and will need to hand load.

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  Sora-tobu chiru

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Posted: August 07 2016 at 3:01pm | IP Logged Quote Sora-tobu chiru

There are many sporterized mosins with original(or SG-43, those are contured and plugged) barrel, that are rechambered to 30-06.
Accuracy is sufficient for hunting purposes(at least for legal distance).

But 30-30 is real chameleon.
Just six years after its itroduction, winchester created version using .321 bullet(so called 32 winchester special).
Marlin users often reload 30-30 with a .311-.312 cast bullets, but theloner can use jacketed ones too


ps. there was russian hunting reduced load for mosin, that used .315 lead bullet:



northumbrian wrote:
or swage the bolt face cup in with a resizing die


Is it possible without annealing?


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  theloner

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Posted: August 07 2016 at 8:26pm | IP Logged Quote theloner

thanks for the replies, this particular project has a 03 springfield barrel fitted to the action. The 03 springfield was chambered on 30-06 giving me a bore of .308, should be ok for a 30-30.
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  Sora-tobu chiru

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Posted: August 08 2016 at 9:14am | IP Logged Quote Sora-tobu chiru

Do You consider 30-40 as an option?
You could get away with only new extractor claw(that is in optimistic scenario).
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  northumbrian

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Posted: August 11 2016 at 7:30am | IP Logged Quote northumbrian

Sora-tobu chiru wrote:

northumbrian wrote:
or swage the bolt face cup in with a resizing die


Is it possible without annealing?




Personally I'd Anneal, but it depends upon the hardness of the bolt head, some are softer than others, I'd do a scratch test just to be sure.


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  theloner

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Posted: August 12 2016 at 7:54pm | IP Logged Quote theloner

thanks for the replies. I have thought about 30-40 krag. It seems as though new 30-40 krag brass has all but disappeared. I took a nap and during that time it became officially obsolete.
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  OldCoot

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Posted: August 14 2016 at 1:31pm | IP Logged Quote OldCoot

Simplest way to go at this is to take the bolt face and solder a washer into place, then recut to fit the .30-30 rim.
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  northumbrian

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Posted: August 16 2016 at 12:44am | IP Logged Quote northumbrian

OldCoot wrote:
Simplest way to go at this is to take the bolt face and solder a washer into place, then recut to fit the .30-30 rim.


Making sure you don't solder the firing pin aperture, or extractor
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