Ever see a Rimfire KB before?  I hadn’t.  Until today.  Customer brought in a Walther with a “Problem”.

This isn’t just from one bad round.  The customer had a second piece of brass that looked exactly like the first.

When we have a KB, there are are two Culprits we look at… The Gun or The Ammo.  Most of the time, the Ammo is the cause.  Remington Golden Bullet Bulk Pack.  I don’t have a lot number or anything.  The Customer Cleaned and Lubed the gun, fired several magazines full with no problem and then suddenly had a jam… then another jam and the slide wouldn’t go forward with the magazine in.  Then he noticed the frame and the brass.  Looking at the brass, the way the casing was blown out like that… I think we have some cases that were double primed.  If it was fired out of battery, the brass would be blown out differently and distinctively, indicating it… in this case, the primer material in the rim blew out the rim.  A normal amount of primer wouldn’t do this, and there isn’t enough case volume for a double charge… but the pressure spike from too much primer – would do exactly this.

Luckily no one was hurt, nothing else was damaged.  We’ll see what Walther and Remington does.