mage, mysticism and necro are 2 fc 6fcr cap. I was told once that necro is 3/6 I never looked into it, most likely not true and/or you can't have magery.
spellweaving, chiv, ninjitsu, and bushido are 4fc 6fcr
If you have magery above 59.9 you cannot be 4/6 chiv. Spellweaving is always 4/6, and you can be 2/6 spellweaving in protection. It's rare but if you see a FC1 mage weapon buy it for this reason.