Winchester spent a LOT of time and effort into determining their choke values and profiles of the choke. The choke is just not a constriction number but a profile, the Ws1 and Ws2 chokes are a good example. Designed specifically for ammunition of the day and SKEET, they were also a hit with upland shooters.
It's not a trivial matter as it destroys the workmanship put into the gun and value.
In any Custom Shop gun, it would markedly lower the value if it could be determined that the choke was altered and therin lies the problem.
How anyone could get the choke right in a Winchester today is a good question except maybe Galazan.-Dick
