Customer : I just got this gun and this ammo seems all wrong. I get cracks and deformed bits on the cases and it just doesn't work very well.
Clerk : *carefully inspects a half empty box of cartridges and finds a mess of split cases and other damage* Well what gun did you say you bought from us?"
Customer : A Judge.
Clerk : Well there's your problem. Judge uses 45 long colt, not 44-40.
Customer : There's a difference? I'm just using what you sold me.
Here's a bit of advice: when selling ammunition along with a firearm purchase make sure it's the right caliber.
Conversely, make sure when buying a gun that you know what caliber it takes. Check the firearm itself, don't just take the clerk's word for it.
That it was a Judge in question is just an extra layer of amusing.
It's fortunate that no one was hurt and that the problem was cleared up. Seriously, read the dang manual, it ain't that long.