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Well actually I think I put up a pretty good argument to P3D's IZ calculations on what kind of IZ NC or SoDak would have against Littorio's guns.

I missed to spot these arguments, especially regarding NC. You were quoting your memory, and I assume you might just mixed up some numbers. Claiming authority of other posters won't convince anyone, I would argue with them too if they'd present such data again.

It also seems funny that range is a big issue if a contemporaries guns outrange a USN BB in these kind of arguments but when it's brought up about superior USN radar/FC it's then announced that no hit was made historically beyond 25-26K therefore impossible. I'm not saying you Red Admiral but some people have came out & said no hit could be made past 25-26K then turn right around and say Yamato could pound two standards into trash before even coming within range of thier guns though standards could definately shoot farther then 25-26K. Actually I think not too many hits are going to be scored past 30K but be that as it may NC's & SoDak's decks are prettty much safe from Littorio's at any concievable range while you can't say that about Littorio's decks.

Ah, I understand. The USN is the one and only navy that can score any hit over 30K, as it demonstrated repeatedly during the war. And the chance to hit magically drops to zero after the distance is past 36K, and that this is hardly an importance. Even if a ship could spend its whole magazine keeping at 37K, and if no hits scored from the fired 600 shells then withdraw using its superior speed, and not allowing the SoDak to close. Even if chances are only half percent, that's three hits.
Also SoDak, as mentioned by zillion times before, was laid down 5 years after Littorio, so the comparison is almost as valid as comparing Littorio to the Iowa or Colorado.

As far as belts go well I posted something to the effect that Bismarck's guns could only achieve PP at around 24K verse NC with EFF penetration at about 21K and it seems from the tables Bismarck's guns do have a 3-4K disadvantage against Littorio's guns verse the same amount of armor so it seems to me that the inner edge of NC's immune zone to Littorio's guns is around 24-25K for EFF her decks safe till about 32-33K. SoDak's decks are even safer while her belt IZ probably could be moved in to around the 20K range.

Ickysdad, you cannot translate 3-4K disadvantage at specific circumstances to 3-4Kdisadvantage at another specific circumstance. To avoid this, it is usally better to recalculate everything. That gives NoCal a dismal inner edge of an IZ. Being able to get penetrated at distances where the longest documented hits were recorded, and having no immune zone on the turret face is a bad thing, especially if the ship cannot make more than 23 knots without damaging her own FC apparatus and radar with excessive vibration.

The same tables I used also understate the piercing ability of US shells. I seem to remember once before this being discussed(NC verse Littorio) and Tiornu made the comment that NC's sloped belt would present an extreme test to the proof angles of any shell.

And the same tables can underestimate the piercing capabilities of other shells, like the Germans (by a large margin), so why not the Italian ones? The only oddball here are the Brits, but their shells usually had an extreme amount of explosive filling so it is not a big surprise if their AP shells are a bit weaker penetrators (the 14" RN shell had larger bursting charge than the 2700lbs superheavies).
And that there's no data does not suggest that the Italian proof angles were bad, it's simply no data.