I had an Uw 9x25 Dillon 124 XTP that didn't fire! I tried twice and the primer barely got a dent in it.
Is that the case of a primer being too hard?
The rest went fine.
Likely seating too deeply, headspacing possibly!
No luck finding that out.
My 124gr XTPs have been fine. But email Justin, he's a friend of mine at Underwood. PM me if you want the email, I won't public post it out of respect for him, sorry.
It's ok, I don't have that round anyway nor the box.