Hi! I just purchased a Marlin 375 cal. rifle from a lady whose husband passed away recently. I am trying to find out info on this gun. It is exceptionally clean and well-cared for. I know they are not produced anymore, but can someone tell me a little about them? Are cartridges still available for them? She gave me several full boxes, but those won't last forever (and God only knows how old they are!). I have searched and searched the net for good info and have come up basically empty. Thanks for any help you can give me!!