Good gouge on the Dominion ammo. Wasn't aware they made "rifle only" ammo, and this makes a good case for consigning any loose DCC .32-20 to the rifle only pile or collectible only.

Regarding damage, you do see K frame .32-20s with cracked forcing cones and bulged cylinders Around Here. And the old-timer gunsmiths will tell you damage like THAT only comes from the "rifle only" .32-20s. About like a steady diet of full-house .357s in a Model 19, you might get away with it from time to time but is sure isn't healthy longterm.

I have seen one posting somewhere on the Web. IIRC it was a Colt Police Positive, and the shooter shot ONE HV shell and the gun locked up tight. The force from the HV shell sprung the crane it seems like, but the PP is a very small revolver. Saw a .32-20 PP the other day and my first thought was that it was a .32 Long.