SVT 40 Barrel specs

H Wally

H Wally

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Hi All,
I've purchased an SVT 40 with buggered chamber (cases bulge badly) and am considering rebarreling to a different caliber. Anyone know the threading for SVT barrels? Anyone know if that threading matches a current commercial firearm with common barrels?


It was suggested that the remington 700 barrel could be cleaned up to fit a mosin, so if the russians stayed with mosin specs, that might be a good starting point on an SVT? Any chance a mosin nagant barrel might be made to fit? I'd imagine this would be the cheapest option, though I don't have either gun in front of me at the moment to properly think this through.

And for those fearing bubba - the gun's can not be fired right now due to chamber damage. Intent it to make it a spec SVT in a different cal, or only do non-permanent alterations aside from swapping the barrel, since that's done for as it is. If the cal changed then obviously it'd require more modifications, so that would have to be addressed at a later point.
 
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desporterizer said:
It would need to use a rimmed case to work properly. Why not whittle a heavy 30 cal barrel to fit & use the original cartridge?
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That's always an option - I'm still deciding whether to stick with the original cal or go for something new - feels like a shame to not set up for a ballistically superior round if I'm going through the work of threading, profiling and reaming a new barrel already - If a mosin barrel fitted nicely I'd probably go with it out of simplicity, and if I could find another SVT barrel for cheap I'd probably go that route, but in the interim, I'm exploring other avenues just in case.

Also, yep, it'd need pretty extensive modifications, but hey, that's the fun in it right? :p

( and again just for clarity - I'm not deliberately altering a good surplus rifle - I'm choosing to use an unshootable gun specifically because I don't want to see a good gun altered)
 
It's strong enough, so if the mag will take it, why not 45-70???? I have always thought a semi auto 45-70 would be a real mauler in the right hands.
 
Superior to the mighty 7.62x54r? You can't be serious. What cartridge beats a 150gr bullet going damn near 2900fps? As for the 45/70, if anybody could get a straight wall case like the 45/70 to feed in a svt, I will eat my hat.
 
Looks pretty easy to do. Not much in the way of complex geometry

SVTbblChamberEnd.jpg
 
30/06 is too long. 308 maybe but would probably not feed reliably & its so close to the original cartridge in performance you have to wonder what advantage would be gained.
 
gaff said:
14tpi 1inch diameter same as enfield .303
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I was thinking that...remember the Globco Mohawk 555? Globco used .303 SMLE barrels.

If you used one the same length as the SVT barrel, installed the gas system, it might work, and better than the Mohawk 555 did. (on them they relocated the gas cyl and there were headspace problems)

That would be an interesting project...
 
Tyockell18 said:
Isn't the action a little on the fragile side to be going upwards ballistically?
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That's one of my thoughts - I'm still figuring that out... right now I'm leaning heavily towards 6.5x55 or back to 7.62x54r, but really that's partially because I'm still gathering evidence on 308 and if that would work. Part of my decision will be sourcing barrels.... a blank will be expensive and a ton of work, whereas a barrel that could be easily fitted would solve a ton of problems so would be worth losing options for caliber.
 
Can you not bore out the chamber, sleeve it and than bore a new chamber for 7.62x54. If you sleeve with superior metals than you may be able to hot load up to 30-06 kind of velocity, or more.
 
anyone know anything about those globeco mohawk 555's?.

They were cut down and relined for .303 but apparently some of them went kaboom and are not considered safe.

I figured it kind of fits in with this thread.
 
Boulevard said:
Can you not bore out the chamber, sleeve it and than bore a new chamber for 7.62x54. If you sleeve with superior metals than you may be able to hot load up to 30-06 kind of velocity, or more.
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I'm not sure a full length sleeve would be reliable for larger cals... I can't really say I have a ton of knowledge on sleeving up, but I'd think a sleeve wouldn't do very well with hot loaded 30 cal cartridges. Perhaps the added diameter on a 6.5mm sleeve might work considering if I went with 6.5x55.... Anyone have any opinions on the safety and probability of success sleeving a barrel for 308/7.62x54R/6.5x55 cartridges?

maple_leaf_eh said:
As in Pattern 1914 Enfield? or No. 4 Lee Enfield? The former is a good candidate. Plenty of metal to work with and generally good bores.
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If the action could take the pressure of a 308 then I'd almost prefer a P17 barrel set back... though I guess the logical thing is to stick with x54R... that's no fun :p

Tyockell18 said:
anyone know anything about those globeco mohawk 555's?.

They were cut down and relined for .303 but apparently some of them went kaboom and are not considered safe.

I figured it kind of fits in with this thread.
Click to expand...

Globeco's are generally considered abortions, though there are a few people who swear by them. I've only ever handled one and man... it was not pretty... rough machine marks and parts just mashed together with no real consideration for function, let alone appearances. Have talked with people who shot some that were constantly jamming, splitting cases etc etc etc

They also weren't relined - they just ran a 303 reamer into the 54R chambers sometimes! That led to some crazy fire formed brass and probably accounts for a lot of the issues. Between the gas system being moved far closer to the chamber, the chambers being cut way out of spec and sometimes having double shoulders, poor drilling for the gas ports and generally poor workmanship it's not a huge surprise that they tend to violently extract, rip case heads off, split cases, vent out around the base and generally malfunction.

That said, I've seen pictures of a very nicely done mohawk - looked identical to the horrible ones, just really nicely fitted and finished... so maybe there were different people doing the work, or whole different businesses at one time or another and they're all now considered mohawks?
 
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