My antiques don't get dry fired without a snap cap, and then only to test them. You can make a snap cap out of a fired cartridge - remove the primer, fill the primer hole with silicone and let it cure, and then it's a snap cap.
Dry firing is more harmful to some designs than others, but even if it is not directly causing damage it still causes additional wear on the action. I avoid unnecessary dry firing simply because i want to preserve the antique for as long as possible and don't want to cause add'l wear just playing with it for no good reason.
It's an antique - they aren't making any more of them. If you want to dry fire a lot then buy a modern saa and dry fire it instead of your antique. It will cost you a lot less that way.