Half cock would probably be best. Naturally you have to clear the nipple. Sometimes, when the hammer is fully depressed, the mainspring link rests below the lower edge of the lock plate, and the wood is carved out behind the outside surface. This means, if this condition exists, that the stock can be damaged if the lock is removed when the hammer is fully down. I would be very, very surprised if a first quality gun like this rifle had this issue though.
Mike