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.
Last edited by FlyChamps; 12/21/20 09:06 PM.