While I'm sure many would tell you how perfect they are with all the precautions and safe actions they take reloading... IME we're all prone to mistakes and I doubt reloading is an exception. Though it as least one that hopefully your processes protect us/you from any mishap but am curious what everyone's "worst" mistake has been. Have known of a few to use the wrong powder to give them an alert, another who missed a primer installed backwards (twice) and having it go off backwards was a fun wakeup call for them, and one particular instance where a smudge in a reloading manual had them loading a 7mm RM ~5 grains over what was meant to be the maximum...
My worst was last night where I had my seaters mixed up and it was acting peculiarly and I couldn't quite put my finger on it. Turned out I was seating my 223 with a Grendel seater. Seemed to work well (decent concentricity too ) but I couldn't for the life of me figure out why my seating depths seemed to be all over the place. Have since fixed them and though it probably would have been no harm got to wondering what some others have done by mistake in the past.
My worst was last night where I had my seaters mixed up and it was acting peculiarly and I couldn't quite put my finger on it. Turned out I was seating my 223 with a Grendel seater. Seemed to work well (decent concentricity too ) but I couldn't for the life of me figure out why my seating depths seemed to be all over the place. Have since fixed them and though it probably would have been no harm got to wondering what some others have done by mistake in the past.