While out searching for Beth, Tom helps out Howard by shooting the thing that attacks Howard 3 times with his sixshooter. Back in the house, Tom asks Howard about ammo. All Howard has left are shotgun shells. Later on, Tom uses the sixshooter again and fires 6 times. As there was no additional ammo left for this gun, he could have only fired 3 more times.
Tom is shown by the fireplace checking the ammunition in the revolver, which seems to be loaded with large caliber cartridges like .357 Magnum. Later when he's in the attic pointing the same revolver toward the viewer, the muzzle is small in diameter as it would if it were able to fire .22 rimfire or .25 caliber.
Crew or equipment visible
In Mucho Mart, just as the camera starts to close in through the curtain in the back of the store where the play was being held. A customer with at least a 43 inch TV box is walking from left of the screen to the right of the screen. The box was obviously empty to have been able to be held simply by the underarm as the person is doing.