James are you certain about placement of the cartridge boxes?

The ones I'm familiar with were made to be worn on the right hip.

In fact, most of the pre-Napoleonic Era cartridge boxes I'm familiar with were suspended not from the waist belt, but from a cross belt. In fact, the crossing belts,( baldricks, bandoleros, straps whatever you want to call them) for the cartridge box and the bayonet scabbard used by British soldiers made perfect aiming points for Colonial snipers during the American Revolution