It will back out sufficiently to allow the bolt retainer washer to slide over the receiver bridge. While holding back pressure on the bolt, with the left hand move the magazine cut-off lever from the back position to the forward position. As the cut-off lever is moving, the bolt should softly snap back out of the receiver. It will slide past the spring without any tricky manuvers being necessary. I kissed many toads before comming up with a princess.
All loads use a wax paper cover wad between the cushion wad and bullet base.
I hope this base line may help others starting from scratch. I am still trying to figure out how you site at 300 meters. Terry Nose-cap with integral stacking bar. Unusually, no provision was made for any cleaning rod whatever. A highly distinguishing charecteristic.