Ruger for years has had something in their manuals wanting you to shoot only jacketed ammo in their 9mm cylinders. They also say, like all most companies not to shoot reloads. I have shot 9mm lead in a 9mm cylinder of a Ruger Blackhawk convertible and 45 ACP lead in a Ruger Blackhawk convertible
. Below is the warning from the current manual. It says you could have some lead build up preventing 9mm ammo from going in the chamber. It sounds like the problem with lots of 38 Special fired and then trying to load 357. You might have to do more frequent 9 mm chamber cleaning. My Blackhawks worked just fine with lead, but you do need to keep the chambers clean. For someone with out a stockpile of 38 brass and all the free on the ground 9 mm brass shooting 9 mm in the revolvers could be attractive
Notes on Revolvers Chambered for 9mm or 30 Carbine: Because 9mm cartridges are manufactured worldwide for use in pistols, revolvers, and submachine firearms, it is possible to encounter cartridges which, when fired, develop pierced primers. If this occurs, discontinue the use of the particular brand or type of ammunition. The possibility of a pierced primer is another compelling reason why a shooter should always wear protective glasses to shield his eyes. Use only metal jacketed bullets in 9mm and 30 Carbine revolvers. When a lead bullet is fired, its base expands and a ring of lead is shaved off and deposited in the shoulder area of the chamber. A build-up of lead rings can prevent proper chambering of cartridges because 9mm and 30 Carbine cartridge mouths seat on the chamber shoulders.