Assuming the chamber walls are thick enough and the exterior of the barrels doesn't have some radical taper just ahead of the chambers, I'd have to agree with the thinking that lengthening would only serve to negate an explanation of Bell's testing results. Of course, one would want to explain the pressure limits of the gun if there were any. I plan on keeping my old Fox and telling the family it is a wall hanger out of fear they might move it to someone with even less knowledge than I have.