What Happens When You Fire the Wrong-Sized Ammo
A while back, Forum member BigBlack had an experience at the gun range that reminds us of the importance of safety when shooting. He encountered evidence that someone had fired the wrong cartridge in a 7mm WSM rifle. The problem is more common than you may think. This editor has personally seen novices try to shoot 9mm ammo in 40sw pistols. BigBlack’s story is along those lines, though the results were much more dramatic. It’s too bad a knowledgeable shooter was not nearby to “intervene” before this fellow chambered the wrong ammo.
7mm-08 is Not the Same as a 7mm WSM
BigBlack writes: “I know this has probably been replayed a thousand times but I feel we can never be reminded enough about safety. This weekend at the range I found a ruptured case on the ground. My immediate thoughts were that it was a hot load, but the neck area was begging for me to take a closer look, so I did. I took home the exploded case and rummaged through my old cases until I found a close match. From my investigative work it appears someone shot a 7mm-08 in a 7mm WSM. Take a look. In the photo below I’ve put together a 7mm WSM case (top), the ruptured case (middle), and a 7mm-08 case (bottom).”
You can see from the photo what probably happened to the 7mm-08 case. The shoulder moved forward to match the 7mm WSM profile. The sidewalls of the case expanded outward in the much larger 7mm WSM chamber until they lacked the strength to contain the charge, and then the case sides ruptured catastophically. A blow-out of this kind can be very dangerous, as the expanding gasses may not be completely contained within the action.
Pistol Example:
My experiences are from IPSC (practical shooting):
As editor noted, shooting 9mm in 40SW is quite common. I run into it maybe once a year. It’s not that shooter doesn’t know the caliber, but a single 9mm round is mixed with reloaded 40SW by accident.
9mm leaves the 40SW muzzle at maybe 100m/s (350fps) and at close range it even hits the target. Usually the gun won’t cycle, so shooter needs to “rack” the gun.
Most of the time Range Officer stops shooting ASAP, since strange muzzle blast hints that something is wrong. If it’s e.g. a squib load (cartridge without powder), clearing the malfunction and firing again could blow the gun…
I guess those little vent holes in actions are there for a reason!