LB
Bell's test, of lengthening the forcing cone, was to explore the specific pressure effect lengthening a forcing cone had when shooting an assortment of 2 3/4" shells in an English type 2 1/2" chamber originally with a very short forcing cone .
Actually Chuck, it had two purposes. One was to determine the pressure increase (if any, and there was always at least some increase) when firing various 2 3/4" shells in a 2 1/2" chamber, and then to see what would happen with the same loads when just the forcing cone (but not the chamber) was lengthened.
