I have an Ugartechea 28 gauge that is hard to open with Winchester AA's and the primers show distinct drag marks. I have no trouble opening the gun with any other ammo including the Italian made Herter's and Fiocchi's. When I reloaded I had no trouble with Nobel Sport, Fiocchi, CCI, Federal or Cheddite primers.
At least with my Uggie I believe that the softer metal of the primer is the primary issue. I solved the problem by not shooting Winchester AA's.
I have this problem with only Federal target loads in one of my Cashmores. It is only on the right barrel and inspection of the cases showed drag and inspection of the firing in showed some burrs had developed somehow. A touch of a file and it's no problem, but I don't often use Federal commercial loads.
![[Linked Image from i.imgur.com]](https://i.imgur.com/qclHjMQ.jpg)
