I would like to know the cal of this flintlock so I can get balls for it. The inner end of the barrel is flared so I'm not sure what the inner dia is. The person I bought it from didn't know much about a similar gun at auction was a German horse pistol , pre WW2 made. .790 or 80 cal. This pistol is also made in Germany and has the same dimensions as the auction pistol. Any info would be helpful.