The stainless steel rod I use to load my target rifle eventually marked itself by being polished from use by the nylon muzzle protecter. I once saved myself from shooting an accidental double load because I noticed too much of the polished part of the rod was above the muzzle when I seated the ball.
Someone started talking to me and when he was through, I totally forgot that the rifle was already loaded and so I loaded it again. I probably wouldn't have blown up the gun but it would sure have ruined my score on the target.
I used a bullet puller to remove the ball and poured out the powder and then shot the first load into the bank.