You never know how the round gets into the chamber. The accidental discharges are always from guns that weren't loaded. Its always "it wasn't loaded", or "I didn't know it was loaded". Negligence isn't an excuse.
Um... BKC45ACP, its a dry fire session. If someone is incapable of keeping ammo out of their gun during a dry fire session or is unsure how to check, then I recomend gunbroker.com. Sell em off before you hurt yourself. Shmackey, I always thumb cock during dry fire sessions as my Open gun is dotted so racking the slide is a wee bit harder. That and an 18.5 lb spring
. Another thing to NOT do, as rex already pointed out the half cock situation, is to drop the slide on an emty chamber. Ease it back down if you choose the racking method.
George Orwell: "That rifle on the wall of the labourer's cottage or working class flat is the symbol of democracy. It is our job to see that it stays there."