I've found the stamp for the Verney Carron. The stamp is two crowns set above "PT", and with a sort of lightning bolt motif below that and translates as "Standard final smokeless re-enforced proof 15646 psi"
The stamps for the Beretta tell me a little less: There I've only found that the gun is good for smokeless powder.
Great link, there, Husqvarna!!
The Nobel Sport cartridges are classed as "Traditional 12G" and "Tradintional 20-16".
I don't think these are firebreathers. It should be OK.
When the right to effective self-defence is denied, that right to self-defence which remains is essentially symbolic.
Freedom: Please enjoy responsibly.
Karma. Another word for revolver: because what goes around, comes around!