I have a SVT40 and its acting strange. I'v cleaned it up seriously, the gas system work prefectly, the ejection is good, BUT... If I put one single bullet in the magazine and shoot it everyhting works great, altough if i put more than one bullets, say 2, it would either slam fire or EVEN detonate the first bullet upon closure of the bolt! Kinda scary... I use CCI primers, and I reload...Using 42 gr of 4895 and 150gr Hornady bullets. But that's hardly the problem since its occuring upon closure of the bolt. Anyone can help? If i close the bolt with only one bullet in the magazine there's no problem at all...
Tokarev SVT-40 acting funny, NEED HELP
- Thread starter Heimrick
- Start date
Hmmm, that is scary.
I'm not an expert but sounds like maybe your firing pin could be stuck. Or maybe the hammer riding the bolt home. I don't know why magazine count would affect that.
I'd check the pin, and make sure the hammer is being locked back.
I'm not an expert but sounds like maybe your firing pin could be stuck. Or maybe the hammer riding the bolt home. I don't know why magazine count would affect that.
I'd check the pin, and make sure the hammer is being locked back.
so... with 1 rd in the magazine, the bolt sheers it out of the mag and chambers no problem. With 2 in the magazine, when you release the bolt it sheers the top round and fires when it chambers, cycles {ejects casing} and chambers the other round? Or does it slam fire both rounds?
Ah ha...jammed how? hung up in the magazine{under feed ramp} or bashed up in the receiver{over/missed the chamber}....if you have a buddy with another mag try his....I can feel the flames already. "that won't cause a slam fire...stuck pin!"
My thoughts are if it isn't feeding correctly something other than the pin is setting the "soft" primer off...try a different mag that works. my .02
My thoughts are if it isn't feeding correctly something other than the pin is setting the "soft" primer off...try a different mag that works. my .02
Get some surplus ammo and see if the problem recurs. (and don't fail to clean the crap out of it after...that stuff is pretty corrosive)
Slamfires and firing out of battery are dangerous as hell to the rifle and to you....you need to make some changes and don't just keep firing this ammo!
I'd say I'm 90% sure it's because your primers are too soft.
Try surplus ammo to see what happen, for reloads, primer must be fully seated. If your firing pin and spring are good and clean, even using soft primers shouldn't be a problem. I shot fews commercials ammo in my swedish AG42 and the cycling on thoses is brutal! but never had problems. If still problem with surplus ammos, check your mag in case lips are deformed.
Jocelyn
Result of the test with the dummy rounds
I used empty dummy rounds with ''playdoo'' instead of the primers and lead 150gr bullets. I was shocked to see a deep impression made by the firing pin in every round after they'v been chambered... The impression is less deep if there's only one round in the mag but its there nevertheless! The firing pin and spring are clean and look like new. The primers of the bullets i shot are well punched and centered. Should i try to put a tougher spring on the firing pin? Should I grind the firing pin a little bit? I prefer reloading than using surplus ammo, its cheaper and i can control my loads.
I used empty dummy rounds with ''playdoo'' instead of the primers and lead 150gr bullets. I was shocked to see a deep impression made by the firing pin in every round after they'v been chambered... The impression is less deep if there's only one round in the mag but its there nevertheless! The firing pin and spring are clean and look like new. The primers of the bullets i shot are well punched and centered. Should i try to put a tougher spring on the firing pin? Should I grind the firing pin a little bit? I prefer reloading than using surplus ammo, its cheaper and i can control my loads.
Wow
I decided to do the same test with my SVT, but use plumbers putty instead of play-dough. Same result. I've never had a slam-fire with mine but this has got my attention.I put both rounds in the mag and cycled the bolt twice to eject them. I think a stronger spring is in order. I don't fire handloads mine. If your going to continue to reload for SVT, I would strongly recommend you get CCI "Arsenal" primers. They are designed for violent cycling actions like the SVT has.
This is a real eye opener for me. Anyone who says you don't need hard primers should look at this.
I would really appreciate if someone else could do this test, for comparison.
I decided to do the same test with my SVT, but use plumbers putty instead of play-dough. Same result. I've never had a slam-fire with mine but this has got my attention.I put both rounds in the mag and cycled the bolt twice to eject them. I think a stronger spring is in order. I don't fire handloads mine. If your going to continue to reload for SVT, I would strongly recommend you get CCI "Arsenal" primers. They are designed for violent cycling actions like the SVT has.
This is a real eye opener for me. Anyone who says you don't need hard primers should look at this.
I would really appreciate if someone else could do this test, for comparison.
problems
When you load the one round, do you put it in the magazine or the chamber? Do you ease the bolt closed on the one round, or let it slam forwards?
There are two different problems that will also result in slam fires. If the ammunition is not of sufficient pressure, the bolt will short cycle, not #### the hammer, and the hammer will ride the bolt back and slam fire the rifle.
Also, a bent, broken or dirty disconnector will do the same as above.
.
When you load the one round, do you put it in the magazine or the chamber? Do you ease the bolt closed on the one round, or let it slam forwards?
There are two different problems that will also result in slam fires. If the ammunition is not of sufficient pressure, the bolt will short cycle, not #### the hammer, and the hammer will ride the bolt back and slam fire the rifle.
Also, a bent, broken or dirty disconnector will do the same as above.
.
is this just a case of the firing pin moving forward and leaving an imprint in soft putty? what does it do with the actual round, just bounces off the primer, most likely not even hard enough to mark it. The OP has either a malfunction or the primers are too soft.
Fix= brand new spring/ stronger spring?
Fix= brand new spring/ stronger spring?
Well, in my thinking, it's enough to set off commercial soft primers on Heimrik's rifle. I am going to get a new/stronger spring and will do the test again. I will also post pictures,as usual. I would still like to see another SVT do the same test to see if there is that much travel with a spring loaded firing pin on other SVT's. C'mon, it's easy and fun.
If this was an SKS dealybob, I wouldn't sweat it. I don't like the idea of a firing pin hitting the primer during cycling.
If this was an SKS dealybob, I wouldn't sweat it. I don't like the idea of a firing pin hitting the primer during cycling.
