Uncharged Big Bang

With level 1 big bang, uncharged does around 1-1.5kk while fully charged does 7-8k.

Could be wrong tho, not too confident in my memory.

It's different depending on magic attack and random chance, as well as the monster's mdef.

My own level 1 uncharged seems to range from ~900 to ~2000 (although the 2k hit only happened once in my trial just now, I suspect it may be that I held the button down a fraction of a second too long). My fully charged is about 7.5k~10.5k.

It's worth noticing that physical range aside, I'm almost always better off using SR instead of Big Bang. While I can do up to 10k in 3 seconds time, I could be hitting ~6k neutral three times in that much time with SR. Maxing Big Bang closes this enormous DPS gap, but that's 30 SPs used just to have a neutral attack as roughly strong as your 3rd job elemental attack is, and personally, I think that's a step backward. The place where max Big Bang is allowed to really shine, is element neutrality and to an even greater degree elemental resistance. But that too is a step backward... this is endgame, how can we have so many monsters that basically say "no, you can't hit us, no you can't kill us". It's really not fair to see all these things resistant and neutral and it serves no purpose to make life hell for those who have had enough hell already, the Mages and the Paladins.