you are right on the shotguns, i never even considered guns with over 18 1/2" barrels, (never owned one)...re pistols, the vast majority of pistols would not fire 7 shots, i did realize there were individual model exceptions but didn't want to bog my post down with details - most folks will have 6-shot revolvers.
Pistols are normally considered to be the autoloaders, such as, 1911's, Glocks, etc, and of course have a capacity greater than 7 shots in most cases.
I'm not positive, but I believe, the vast majority of modern revolvers sold today for self defense are the 5 shot snubbies. Yes, the 7 shot S&W is certainly not the norm.
The point of all this is to avoid the danger of absolutes in our posts.