I'm not intimate with Citories; but, O/U guns have common features. It's hard to evaluate a bad primer or light/short firing pin strike after the fact -- ideally you'd have well scrutinized the shell before loading. In forty+ years of shot-shell reloading my only failures to fire have resulted from something obvious, like a broken spring or firing pin. I'm old school, and I've always reloaded shot-shells with the primer brand same as the hull.
I tend to agree with my friend, olddrum1, there's likely something on the lower pin's shoulder that's impeding the firing pin. With my O/Us, the lower barrel gets a lot more action that the top. Consequently, problems usually occur in the lower barrel.
Depending on the geometry of the action, the upper barrel frequently has a better mechanical advantage than the lower one. There's a longer resultant moment arm with the top pin. This may contribute to lighter strikes in the under barrel -- there's nothing you can do about this.
There's also the possibility of a manufacturing error. One of my buddies had a problem with his P-Mirage. His gun was a transitional model when Perazzi was altering its manufacturing process. A factory pin would not work in his lower barrel. PerazziUSA modified (shoulder set back) a set of factory pins to fit his specific gun.
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the FTF's were all with a buddy's reloads
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My personal rule is to avoid another's reloads. You're lucky, you just had a failure to fire -- I've witnessed a breech failure (Belgium Browning) using a friend's overloaded reload. My friend, I don't recall, have you had any FTFs with quality factory ammo?