First shut of the powder and shot. Take out the knurled screw and remove the containers with base. Make sure you do not move the loading bar. Pull off the cap on the shot, put your hand on the powder cap and pour the shot out. If you want to pour out the powder, make extra sure you have your hand on the shot cap because the weight of the shot will push the cap off. Jon
+1 on what Jon said. I usually hold the base in my right hand and tip the top of the tubes to the left. You can actually hold both caps at the same time with your left hand if you want to.
If I'm changing the bushing for powder or shot, I just lay the tubes over on their left side while holding the caps with my left hand. When changing bushing, tilt the tubes such that the components runs to the TOP of the tubes which you are holding with your left hand. That way you don't spill shot or powder when you remove the charge bar and bushings.