Problem: I have a few hundred empty brass casings for 5.56. Old military stuff from Serbia. Being good engineers and strictly observant to SAAMI standards, the former communists went one better. They crimped the primers into place, so they are less likely to fall out. Thus, there is the crimp “ring”.
That isn’t a huge problem in itself but it frequently causes the new primers to miss the pocket during reloading. The common solution is to take the case mouth trimmer and ream the pocket just a little. I use the reamer pictured below which has the disadvantage of having three sharp prongs on the holding side, since this same tool works to trim the outside of the case mouth.
Here’s how it’s done. Meticulous, time consuming work with small sharp objects in each hand.
MY SOLUTION: The interior tang in the reamer tool fits just right in the chuck jaws of my drill press. I don’t even remember why I bought this. But this is the first time I remember using it.
You may want to wear heavy gloves and eye protection for this. Also, use the lowest speed setting your power tool will permit.
The result is batch processing a hundred of them with no trouble in a few minutes and no harm done to my hands.
Just thought I would share.