The gun was they type used many years ago. The cylinder does not swing out as many modern revolvers do. There is a loading gate on the side that swings open after pulling the hammer back a small amount to a notch so the cylinder will be free to rotate. You only see the back side of one round at a time. The cylinder has to be rotated so the back of each round can be seen. The only real way to know what was in the gun would be to push out each round one at a time by the loading gate.