While it's not a handgun or Hornady issue, I used to shoot a lot of trap with my Browning Superposed. At the Grand American the use of factory ammo is required. I had a bunch of Winchester AA ammo go 'click' and I took it back to their tent on the grounds. I heard back from them a couple months later with the answer.
Sir, your model 12 has an excessive headspace issue.
I've been shooting Federal ammo for the years since then in my shotguns, rifles and handguns when factory ammo is used.
Good luck getting your non-fire issue resolved to your satisfaction.

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Lynnie, Professional Pest