I never used to worry about how my shotguns fit. I shot basic, American shotguns most my life — mostly Remington pumps, plus a double-barrel Savage/Fox Model B. These were off-the-rack guns with standard dimensions – a 14″ length-of-pull with 2 1/2″ – 2 3/4″ of drop.
It was until I became serious about side-by-sides and bought some classic America doubles that I started to pay attention to stock length and drop. Now fit is one of the first things I look at when considering a gun. Afterall, no matter how nice a side-by-side is, it’s not worth much to me if I can’t shoot it well (or at least OK).
Check out this little video for an quick explanation of why fit matters: