Saw a guy blow up a CZ bolt rifle a few years back. Turns out he had used 4831 instead of 4198. The rifle looked similar to the one in the pics. He lost half of his jawbone and his right ear, shrapnel just missing his jugular. Like DaveB said if in doubt I will pull my bullets and have done so. I only do one process at a time when reloading. But, you know, we are all human. I would recommend that if your tired, or sick or have something troubling you, it's not a good time to reload. BTW: go slow, think about what your doing. When pushing a max load check double check, one small mistake can send pressure skyrocketing.