Masteries are an Array of [70] and the maximum XP per array is 524,000 :P
Remember that array of byte are limited, i'm not even using Array of bytes to generate premiums stuff and NPC weapons (npc weapons cannot be saved) there's alot of thing impossible to do with Array of bytes.
I also made 2 PowerGrep Actions that allow an entire conversion of Private into Public (which mean i can execute any function within the class), more than helpfull isn't it ?
Your best bet is to write your own .as3 code, and execute function by passing arguments on the fly, well it's not a tutorial but YOU guys should go deeper into this than just making AoB with jpexs (most of the time AoB is needed) but for specfic game function such as executing or reading variables, you CAN'T WITH AOB.
Ps: i'm not bragging i'm serious, always. 
If you intend to generate premiums gun, set your weapon grade, set your current xp/masteries, your mp games, token revive, your amount of time played (account), your number of monster_type killed, convert your current class (Assault -> Medic) or grant yourself a temporary Black Diamond Badge....(and much more) i wish you luck with AoB lol.
In 2291, in an attempt to control violence among deep-space miners, the New Earth Government legalized no-holds-barred fighting. Liandri Mining Corporation working with the NEG established a series of leagues and bloody public exhibitions. The fight's popularity grew with their brutality. Soon, Liandri discovered that the public matches were their most profitable enterprise.
[IGN] KissMyWeapons019