The pumpmaster shoots both BBs and pellets. If the rifle is full of BBs then "NO" it only takes a moment to reload. If you are shooting pellets then each pellet must be reloaded by hand and that only takes a few seconds. You will spend more time pumping up the rifle than loading it.
It took a minute or two.
30-40 seconds for a skilled soldier.
This BB gun was made by WHO?
If you are asking about a pumpmaster made by Crosman then see the related link. There you will find at the bottom of the page a section called "download a manual" that will take you to all the Crosman owners manuals.
The Crossman 760 Pumpmaster, It's Powerful, Safe and works like a real gun
To reload your gun in the game simply press 'r'. So easy a caveman can do it.
there is a button at the top of the screen that says reload click it to reload
When th ammo in the sentry gun reaches 0, then you can reload it. To reload, walk on top of the sentry gun and press the F key. I'm not sure if you can reload it when there is still ammo in it though, but you can try. When you reach the rank Colonel, once you set up a sentry gun, you will have double ammo for the sentry gun, and you can reload it faster.
shoot outsid the screen that should reload your gun.
Chamber
you have to get the USP pistol and empty the clip and when you reload it will "flip" the gun
default is R. goto options keyboard and look for reload key