A friend of mine learned some new rules while at the range the other day:
- Do not let yourself get distracted while at the range
- Do not let “Range Brass” or “Found Ammo” get mixed up with the stuff you brought with you.
- Do not put 9mm into a .40 firearm.
Failure to follow these rules can lead to bad things happening, such as this:

Sorry about the cell phone picture, but I think it’s quite evident that something happened that shouldn’t have.
My friend recently took his new KelTec Sub2000 in .40 out to the range. His wife and he like to shoot, and they reload. His wife was picking up the fired 9mm brass that was scattered around their firing position from a previous shooter, and she found an unfired 9mm round. She placed it on their table, and it just so happened that it ended up next to some of their .40 ammunition.
Now, my friend is not new to shooting, and is a very conscientious kind of guy. But apparently a moment of paying attention to the guy next to them, who was shooting a .50 BMG rifle, led him to make a mistake. He was refilling a magazine for the KelTec, and that stray 9mm got mixed up with the .40. The magazine started out with a .40, then the 9mm, then filled with .40.
My friend put the magazine in the gun, put a bullet in the chamber, and proceeded to fire away. He says he noticed that one of the rounds felt weird, and the action didn’t cycle properly. He worked the action, ejecting the brass, which fell to the ground. He didn’t notice anything weird other than that. He continued to shoot, and reports that there were no issues.
It wasn’t until he was cleaning up his area before he went home that he figured out what had happened when he couldn’t find that loose 9mm. As he was sorting through the brass from the trip, he found the casing in the picture above, and the full story of what had happened came to light.
He inspected the gun when he cleaned it, and found no evident damage. The chamber looked OK, as did the bore. He’s going to take it to a gunsmith before he shoots it again.
To me, this is analogous to the admonition that we got during hunter’s safety training to not carry both 20 gauge and 12 gauge ammunition while you’re hunting. The smaller round was capable of being loaded into the larger magazine and chambered in the gun. Apparently it was even capable of being fired in the larger chamber, and luckily for my friend, it exited the muzzle without causing a catastrophic failure. At first glance, it appears that the only damage was inflicted upon the case. My friend got very lucky.
The thing is, I can visualize myself doing the same thing. When I go to the range, I have guns of different calibers on the table all the time. If I didn’t pay attention, how hard would it be for me to mistakenly put the wrong bullet in a gun and try to fire it? It’s a reminder that we have to pay attention at all times when we’re enjoying our sport.