Cock the trigger.

Pull the barrel forward until it is disengaged from the latch, which prevents the barrel from rotating.

Turn the barrel 90 degrees and rest it against the frame of the barrel (this will happen automatically on the spring).

Insert the cartridge into the chamber, then pull the barrel forward and turn it 180 degrees, insert the second cartridge.

When inserting the cartridge, the side of the cartridge with the gray mixture should face the trigger.

Return the barrel to the original firing position.

Make a shot, then turn the barrel 180 degrees and make a second shot.

WARNING! To shoot, you need to press the trigger a little down, as in the photo with a green arrow, not with a red one.

Kindly watch the Swivel barrel Frank Wesson Derringer action video here