Ah, named bullet doesn't auto-hit, just makes it threaten a critical if it does hit- misfire is a specific firearm only mechanic where if you roll within the misfire range of a firearm, it jams and you have to spend time to fix it- for a LMG the default misfire is 1-2, here, from the Aonprd section on
Firearms
"
Misfires: If the natural result of your attack roll falls within a firearm's misfire value, that shot misses, even if you would have otherwise hit the target. When a firearm misfires, it gains the broken condition. [etc.]"
And the Greater Reliable enchantment reduces a firearm's misfire by 4, to a minimum of 0, meaning at that point it never misfires without outside tampering. Admittedly not as solid as the sheer axiomatic declaration of a Named Bullet spell outright stating "No, this will no longer misfire", but still worth noting.
Well, and Technological Firearms don't even have a misfire rating at all.
But yeah, I hadn't known about the Named Bullet spell, that is potent on your soldier guy, I think that means he full attacks for something like "+15/15/15/10 (2d6+21/x4)" (optional -3 to attack rolls to add +6 to damage with Deadly Aim, or by taking an additional -4 they can get yet
another attack at their highest BAB due to Automatic weapons being able to act as semi-automatic as well), Threatening to crit for 8d6+21, and targeting Touch AC to a distance of 500 ft. And I'm just now realizing they'll probably crit fairly often, since
"Precision (Ex): An A.C.E. Clockwork Soldier rolls twice to confirm critical hits, taking the more favorable result."
Huh, yeah, that is liable to absolutely
shred a target, even moreso than I had initially thought. I love it.