Svt 40. Help!

SuperJohn

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Napanee
So I buy a svt 40 from an online classified. $250, with a bag mixed ammo. Rifle looks good, figured I made off like a thief. So today I shoot it. The bag of ammo was steel cased mfs soft point and s and b soft point. The mfs worked ok, then I switched to the sellior and bellot. Fired 3 rounds, with the last one leaving the gun very smoky, checked the cases and the first 2 had primer dents that were puckered around the edges, and the last was a pierced primer. Needless to say I stopped shooting. I looked through the bag of ammo and found a couple of the mfs rounds that had light primer dents. Contacted the seller, of course he never had any problem with it. Did I just buy a wall hanger or is there a fix?
 
Not sure what you mean by puckering. extremely flat is a sign of high pressure. Take some pics of the primers and put them up. You could try some other ammo. Pierced primer might just be bad primers too. I had a bad batch of remington primers that would do that. Switched to cci and no more problems with the same load.
 
By puckering I mean to say that the edges of the firing pin dent were raised. I was just reading that commercial ammo uses lighter primers. Whereas military primers are harder to prevent slam firing in automatic firearms. I might just have to get a few
rounds of surplus and try em out.
 
Buy a couple boxes of new ammo, mfs, milsurp and see how it shoots with known ammo. I had a fail to eject that I was pretty sure was a rough burred chamber, just to be sure I picked up some surplus ammo and some mfs. Polished the chamber and my svt shot new norc, mfs nicely didn't bother to shoot the surplus. Always nice to start at zero and see what it does, if it does the same thing with various ammo brands you might need to dig deeper into the gun itself.
 
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