Hey thanks everyone for the input, this is useful stuff!
Ammo I used was Federal .22 LR Champion Value Pack
Answers:
Thanks for the advice on looking at the ammo to see if hit by firing pin...found several bullets with the indent in them I saved from the range.
Zero failures to feed or eject.
I haven't tried other ammo yet, I will. I'll also follow the advice on the guide rails post cleaning!
Picture of ammo that was hit, but didn't fire: