Niklas,
The forcing cones are far away from the choke problem many of us have seen since steel came on the seen. They don't equate the same way. Mike will probably come back with the technical explanation but for now I'll add my 2 cents. The bridging of the larger shot thru the tight chokes cause the buldges we see. This is why the limit of mod chokes and #4 steel is often discussed. The forcing cones go from chamber to bore which is less restrictive than from bore thru chokes. The forcing cone length can improve patterns and some say perceived recoil. That usually is good for a debate with many opinions.
Best of the New Year,
Ron
