After some through searching I've come up empty-handed in regards to the amount of magic accuracy obtained from the Cobra Unit Set bonus.
According to ffxiclopedia the set bonus is an additive effect based on the number of pieces you currently have equipped.
I'd like to be able to figure out specifically how much magic accuracy this set bonus gives. What I need help with is links to information or guides on how to test and measure magic accuracy.
Google wasn't much help with this, but I'm fairly sure there must be a method. Hopefully I can get good enough results to say how much of a bonus each piece of equipment gives!