My Holland fired both barrels last week at the range. What a pleasant surprise! I had been firing right barrel then the left barrel and everything was fine. Just for the hell of it I decided to fire the left barrel first. I pulled the trigger and was surprised by a really fierce recoil! I broke the rifle and both cases ejected. That was it for the day. I packed up the rifle and sent it to an English gunsmith who does great work on double rifles.