Does anyone know the distance between the two inside barrel centerlines and the distance between guns on an F4U? An eWAG gives me about 20 feet for the bank distance and 1 foot for the barrel distance.
Yes, there is a reason, no it isn't particularly important. I did some modeling for convergence on the F4U and concluded that if you set the inside pair at 350 yards you would need to increment the others by 43 yards to keep the bullet streams from each bank parallel. It works out to just over half a degree of inward deflection on the guns, which seems to be the right order of magnitude.