It seems that with me coordination strikes every seven seconds. I'm most likely to drop a box of bullets scattering them across the floor or ground if I have just loaded up some experimental rounds with different powders and bullets. When I've got 4 different bullets and 4 different powder combos trying to figure out which a rifle likes best, well you get the idea. I still just put a label on a cartridge box when they are all the same after things have been sorted out, but lately I've been using a fine point Sharpie permanent marker to label each round. I include the bullet and weight and powder and grains. It only takes a few seconds and also helps when examining the cases for pressure signs. Even though it's called permanent, the ink wipes off with alcohol. It think all in all it's pretty cheap insurance for about a minute of time. I sure beats pulling bullets and remeasuring powder charges to sort things out. On the other hand if you're not as naturally clumsy as me it might be a waste of your time.