these shells can not be bought can they...reloads i guess?
I once owned a beautiful Ithaca 20 ga with Damascus barrels. I shot standard factory loads in it just fine. I can't recall if it was Nitro proofed or not.
I recently read that early "fluid steel" barrels failed proof frequently compared to Damascus barrels when smokeless Nitro loads were being developed by the Brits.
Well past the turn of the century, you could order a 'best quality' double rifle with Damascus barrels.