Ahhhh the techinal term for this is "going into 2x4". That means it takes a 2x4 to get the bolt open.

Sorry to say but pretty common on SVT 40's. Had the same problem and fixed it by haveing the chamber reamed out just a little. Now it shoots fine.

One thing to remember about the SVT's is they do use an adjustable gas system.

This is the small numbered part sticking out near the end of the barrel. So just keep this info in mind.

Start at 1.1 and work up to reliable extraction and feeding. You should find it at 1.3 or 1.5 Be sure the gas port lines up in the regulator and the muzzle extension key is centered allowing all gas to pass through to the regulator and gas system.

Another problem is a loose gas nut. If this is the case you will have to get the correct wrench to tighten it.

If you do this then you should have less problems with your rifle. Congrats on the cool new rifle.