SVT 40 Barrel Throat
- Thread starter divealta
- Start date
DJdeadlyDALEK
CGN Ultra frequent flyer
- Location
- Waterloo Region of Ontario
Reminds me of the old Disney movie "The Black Hole" from 1979
Ya, I basically did that already, I just didn't want to commit to mixing the serial numbers. I was hoping to keep one numbers matching and have a mix and match shooter. Guess I have to buy one more. Oh damn.
I see gas erosion from the neck crenulation back into the shoulder. This type of wear is pretty much inevitable in the design. The SVTs I have all show this to a greater or lesser extent. They can fired safely in this condition. There is no particular reason to believe that accuracy is seriously compromised.
Crenulation was probably not in the original SVT design but was added as a stop gap measure to aid extraction. At the time an auto loading infantry rifle was a cutting edge (Germany was still using the M98). The design team knew they were sacrificing durability but decided that this was an adequate compromise outweighed by the advantage of an auto loading 10 round rifle.
Or is there something in the picture that I am missing?
Crenulation was probably not in the original SVT design but was added as a stop gap measure to aid extraction. At the time an auto loading infantry rifle was a cutting edge (Germany was still using the M98). The design team knew they were sacrificing durability but decided that this was an adequate compromise outweighed by the advantage of an auto loading 10 round rifle.
Or is there something in the picture that I am missing?
- Location
- Georgetown Ontario
CRENULATION! Never heard them called that before. LOL but ya a inevitable problem that results from the design of the chamber. Wouldn't worry too much unless it affects headspace or grossly affects accuracy.
Nothing missing in the picture.
It was too show what it looks like for those who do not have the means to see that close and wondering why their casings look like a old Genuine Draft beer can from ejection. Good description marc_j, thanks for adding it.
CRENULATION: having an irregularly wavy or serrate outline <a crenulated shoreline>
Yes, there is corrosion and some pitting, the patches left a pile of fuss, so it is hard to see the bare metal. I'll try taking afew more pictures tonight.
It was too show what it looks like for those who do not have the means to see that close and wondering why their casings look like a old Genuine Draft beer can from ejection. Good description marc_j, thanks for adding it.
CRENULATION: having an irregularly wavy or serrate outline <a crenulated shoreline>
Yes, there is corrosion and some pitting, the patches left a pile of fuss, so it is hard to see the bare metal. I'll try taking afew more pictures tonight.
So true !!
That's why I use a brass brush between the cleaning and the oiling... gets rid of the fluff left behind by the patches.
I'm still cleaning out the 70 + years of untouched copper deposits in my shooting SVT. The others will stay in cosmoline for storage.
Brass brush won't get all of the fuzz out of there. 1st shot will!
You'll be surprised what you think looks clean until you use a bore camera. I have a 1905 WSL .35 that with the naked eye the barrel looks great, until I ran the camera down her, there was very little rifling 6" past the breech.
Not sure if I am allowed to post this link. But here goes. http://bpcr1885.net/34-borescope/ A small investment of one of these cameras will help you out in the long run.
Brass brush won't get all of the fuzz out of there. 1st shot will!
You'll be surprised what you think looks clean until you use a bore camera. I have a 1905 WSL .35 that with the naked eye the barrel looks great, until I ran the camera down her, there was very little rifling 6" past the breech.
Not sure if I am allowed to post this link. But here goes. http://bpcr1885.net/34-borescope/ A small investment of one of these cameras will help you out in the long run.
I guess the correct term is "flutes" rather than "crenulation". Either way it was an effort to provide reliable extraction of spent cartridges. It comes with the inevitable side effect that propellant gases will erode a groove first in the neck and then in the chamber. As I said in my earlier post, the designers would have known this would reduce the service life of the rifle but were faced with few options; everybody in the USSR knew that war with Germany was inevitable. As it turned out huge numbers of these rifles were lost in the first 3 months of the war so the durability aspect was a mute point (unless you were a German soldier with a captured one).
You can always tell by the spent casings at the range who has been firing SVTs and who is firing Mosin Nagant, M38, M44 etc.
You can always tell by the spent casings at the range who has been firing SVTs and who is firing Mosin Nagant, M38, M44 etc.
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