[KegRiver]

For decades hunters have successfully downed birds with shotguns.
Most of those hunters knew nothing about fit and the few who did, knew that in hunting, it didn't make a lot of difference to those who knew how to shoot well.

Then along came gun writers and self proclaimed experts who told everyone they had to get their shotguns fitted.

Good advice for those who have access to honest people who know how to do the job. But for a good many hunters such people were non existent in their neighborhood.

That pretty much leaves only one option, learn to shoot well with what you have. You may never win a shooting competition, but for a lot of hunters that is not the goal.