So I've had to accidental discharges with my 91/30. Both cases were safely discharged downrange luckily. On both cases when the bolt closed, the bolt did not stay cocked, immediately striking the primer. I believe the problem is a worn sear. I'll try to post pics after work tomorrow. Symptoms include: bolt not catching and sliding right out of gun without pulling trigger, bolt not staying cocked, and intense irritation on the shooters part. Would replacing the sear and trigger fix this?
It sounds like it's time to retire your mosin. With everything you need to do to fix your rifle it will most likely come close to the value of the rifle. They're only worth about what you pay retail.