I bought a whole case of Tula and then three sleeves (1000 ct. boxes) of Wolf from a fellow here on THR last summer. The price was GREAT but I have mixed feelings using them for my SR9c. When I started with them, I was having quite a few problems, needing 2 or even 3 strikes with my Ruger to light off. Some wouldn't fire for love nor money. Someone here on THR suggested I wasn't seating hard enough, so I've been pressing them home as hard as I can, slightly below flush but the Ruger still has the occassional FTF on first-strike. Out of my CZ85 and my Model 15 S&W I can't say I've had any problems since I've started seating harder.
Someone earlier in the thread mentioned striker-fired guns may be the culprit and, in my case, that seems to be true. For plinking ammo I'm not worried about it, albeit a bit frustrated sometimes. If I were rolling my own SD ammo or competition ammo and planned to use my Ruger, I would use a different primer.
Q