Cartridge cabinets

Q) As I have been shooting for many years, I have collected a large variety of shotgun cartridges and would now like to mount them in a display case. How do you mount cartridges, allowing for the fact that the lip does not allow it to lie flat? C. SAUNDERS…

The pellets keep jamming in my airgun!

Air rifles: I recently purchased a C02 powered semiautomatic pistol, marked Crosman Model 600. I was assured it had been fully checked before sale, but I cannot get it to repeat fire through the magazine.