Gentlemen, I took some measurements with my dial calipers so they are an estimate at best.

All from the rifle barrel, at the breech .70" , this would include the case, at the muzzle .30". Depth from the face of the breech to the rifling's 2.5 inches. Possible total length of the round or just the case? Length measurement was to a very small ridge where the rifling's started. Rifling's are very shallow, 6 grooves.

The rifle barrel has a W stamped on the underside the same as the shotgun barrels, could this mean the rifle barrel is also choked to some extent?

The shot gun barrels, right barrel is slightly more open at the muzzle than the left.

I am working on pic's