While I have never seen it.. I have visited with several "experts" who state it is very prudent not to shoot monolithic solids in older doubles especially. I visited with Paul from Jeffrey double rifles at the SCI show this year---he stated the metal used in the older firearms was not as tough as the metal used today and therefore they are more susceptible to damage from solids. I also visited with the Westley Richards shop here in my home town --they also cautioned against using them in older double rifles. Thank you.
Ripp