I have a new model Blackhawk in .357 (6.5"), and it eats the same top end handl0oads that my Model 28 does. Loads that are too hot to use in a model 19 or 66 (or, it turns out in a Contender or even a Marlin carbine!)
The Ruger will shoot these loads, recoil, and then look at you and say "What? That's ALL you got?"
Seriously, don't worry about wearing out a Blackhawk with any factory load, even the hot ones.
Sure, it can be done, I suppose, but it will take a LOT of rounds, several times the cost of the gun in ammo, before you get even close...