Loading shotguns is an art that needs to be practiced.

To load a pump, open the action and just throw the round into the chamber.

Then just slam the action shut and it is loaded.

To load the magazine on a pump, just throw the round up into the loading port.

Then push it into the magazine like you are trying to shove it out the front of the gun.

Do this 300 times and your thumb will look like mine.

Loading a semi auto is the same for loading the opened chamber.

But to load the magazine, you must use the shell to push the release on the floor plate, and then push it into the magazine.