Well, hey, I finally got out to the range today. Just been busy. Did find some of the same loads that misfired before. Followed the gunsmith's suggestion and tightened the screw under the grip. Turned about a quarter turn clockwise before stopping.

Ran 28 rounds of that same ammo through today and no misfire. So tightening the screw worked. From reading through the helpful feedback guess I should add some lock tight to the screw.

If it works on the ammo it didn't work on before guessing it'll work fine with the Federal I have on hand.

Thanks for all the help with my learning curve.

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686+, 351PD, Governor, M&P