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did you try to shoot it out? What type bullet is in it? you can soak the powder with water or WD 40 then use a bullet screw. Or try to pop it out with pressure, they make a device to thread in and use co2. Or if you have not soaked the powder, use a pick and make sure the hole is open, then put in primer and it will fire.
the plugs need a type anti seeze when install, remove and clean every time they are fired, they don't need to be real tight. Put your wrench or socket, what ever fits it tight, make sure the powder is soaked and can't fire or empty rifle, and tap on the wrench, you'll have to hold the rifle barrel some how, don't damage the stock on the blueing, use leather or a barrel vice if you have one. WD40 can help loosen the threads and the fouling or rust if that is whats holding it.. Its a problem, Hope this helps. Loco
