I tested two things today, first, Whether or not there is a crit cap cap. There DOES appear to be one. Or, alternatively, some of the cricial perks do not get the critical multiplier from the weapon you are using. But the main thing i wanted to test was criticals. I made a highcrit sniper chaarcter who should crit nearly 100% of the time in VATS. Then I used hollow point bullets with a sniper rifle versus regular .308. If the criticals really did ignore armor, they would also get the damage bonus from the HP on top of it. Net result after killing several deathclaws: criticals do not ignore AP.

Seems consistent with my Quarry hunt today; takes 2~3 shot to kill a DeathClaw before I switch for AP rounds.

But .308 Hand Loaded is still the beast.

there was a critical cap in FO3 too, easily testable with the deathclaw gunlet, something like 75%, it's probably the same here ?

I've heard people say that only the critical hit damage ignores armor and not the normal damage and I've heard other people say that instead of ignoring armor a critical hit adds an armor peircing effect identical to the -15 DT of AP ammunition. No idea which, if either, are true though.

Did you keep in mind that weapon condition also impacts critical strike chance?

Only EW Crits ignore armor.

Has this been confirmed in the GECK?