I have 2 that I can think of at the moment. #1 Many years ago when I was new to the reloading game I proudly loaded up some 30 cal 150gr Spire Points. Had them all measured perfectly everything was good........well not exactly. Here comes the flaw I took the rifle and ammo to the range. Got everything set up, targets were up, bench rest bags set...proudly took out my new Marlin 336C 30/30 lever action started to load the rounds into the tube mag.......do you see the problem? After a I stared in disbelief for several seconds with heavy sighs and drooped head I took down my targets, put my benchrest bags away, put the ammo back into the ammo box and went home. Spent the next couple of hours using a kinetic bullet puller unloading the rounds with naughty words abounding. Yes I know I could have fired it single shot but wanted to use proper bullet for that rifle. #2 As just posted on another thread in this forum. Forgot to put powder in a 450 Rigby round. The benefit was I video'd the event. For those new to the shooting game: Hangfires or Misfires....KEEP RIFLE EITHER SHOULDERED IF SHOOTING OFFHAND, OR FROM STICKS, OR KEEP RIFLE POINTED DOWN RANGE IF SHOOTING FROM THE BENCH. WAIT 15-30 seconds BEFORE opening the bolt. The other benefit was that I also noticed a naughty flinch.