|15% of these cartridges had longer cases than the rest. This was causing my brand new LCP to jam. At first I thought it was the gun, but then compared one that fed to one that wouldn't.
There was approximately 1/64 - 1/32 difference between the two, and it was enough to keep the slide from closing completely.
Tried different ammo from Sellier & Bellot, and several other manufacturers, without any issues.
The UMC has been sorted, and I am left with 3.5 trays of "good" ammo.|