RE ww primers, if they are brass color they are soft. If silver they are some of the hardest out there...
TI pin... first time you pierce a primer you have a really expensive paperweight... FWIW.
The issue can be as simple as too light of a trigger. Anything 3.5 pounds or so or less, thats not 2 stage, generally speaking, can give issues.
And some of those are related totally to how the gun is held, how it recoils and how you hold/pull/reset the trigger...
Rost, I have a good supply of silver WW's circa Y2k and they are very soft. Same for the new silver WW pistol primers I bought.
Did the specifically harden the cups on their small rifle primers, because I haven't noticed it on their large rifle, pistol, or shotgun primers?