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Just trying to take a shot here....

Did you try to rechamber and fire the misfires? If so, did any fire?

The powder has nothing to do with it, you are just not achieving primer ignition.

Were the primers seated too deep? (and for that matter, what do you use to prime the cases?)

And finally, did you measure you case lengths before loading?

(Stop me if you already know this, but...) Straight-walled pistol ammo headspaces on the case mouth. If the cases are too short, the impact of the FP on the primer may be enough to dimple the primer, then the case moves forward in the chamber, and no primer detonation. COAL does not matter if the case is too short or too long, since the headspace is on the case mouth and not on the bullet itself. And cases too long will prevent (or should) the slide from returning to battery, preventing the gun from firing. It is possible your cases are too short. Was the brass of the same headstamp? How many times reloaded?

Alternatively, you could also check the firing pin channel and striker spring assembly for dirt or crud on it. Do a detail-strip of the slide, check and clean, do not oil.

Also, are there any significant differences in the profile of the bullets you are using? Differences in point geometry, ogive, and so on. It looks like your COAL is uniform, but are the bullets the same length? I know this doesn't matter if the gun didn't fire, but also look at seating depth.

7.8 grains of HS6? ....what velocities were you getting with that one?

Just trying to help figure this one out.
 

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Somehow, and I may be totally wrong, I do not think it is the gun.

My reasoning is: identical primers, same firing pin in all cases. Some fired, some did not. So the primer brand is constant, as is the firing pin mass and impact energy, so it must be the ammunition. Powder charge and bullet weight is irrelevant because the rounds did not fire and so these factors do not come into play.

I am still kinda leaning towards inconsistent case lengths (the length of the brass without the bullet, after sizing but before expanding).

Does that make sense?

Man you got me scratching my head on this one!
 
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