They must have decided there was zero chance of the front charge going off could cause the rear charge to go off at the same time. If forced to shoot it Id never put percussion caps on the rear nipples until the front ones were fired. For that matter Id just load the rear chamber area and forget the front ones. Wonder how much powder you get in your face, when you fire the rear charges, out the front nipples? Burning powder, six inches from your eyes, must have caused a lot of problems. Another design which died a quick death.
