Does anyone know of a website where you can choose firearms and see the silhouette of one in front of the other to get a good size/shape comparison?

This shows handguns with a hand outline, it may not be what you want. Its called "mouseguns" but includes some 40 and even 45 cal.

http://mouseguns.com/PocketAutoComparison.pdf

This was posted on another forum. I wish they had more choices.

https://nivlam.github.io/