Since it no longer has the original stock, after checking the crown/bore I would check for stress points along the barrel where it contacts the stock. SKS barrels are notoriously thin and heat up almost immediately causing barrel tension to become an issue if the stock is not inletted properly...if it's not the stock/barrel fit, the barrel could be shot out. I have a Rossi .243 single shot that had the same problems as you mentioned. After extensive cleaning to remove copper fouling over a 7 day period I focussed on the stock/barrel fit - after relieveing all stock material from contacting the barrel and still having the same problem, I concluded that the barrel is worn. It was a $200 gun brand new with a 20ga. interchangeable barrel. Now I have a $200 single shot 20ga. shotgun! The moral of the story - don't buy cheap guns!
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Last edited by RL357Mag; 05-19-2008 at 02:02 PM.