Cerberus.Raseraun said:
»Luckily I already have that gun, I was thinking of using it for this exact purpose.
Off to /dnc and solo mobs in Abyssea, thanks alot guys!
Worms in Abyssea were great, but I found that at around 340 the skill ups slowed down drastically. (and as such, your gil cost for bullets rises)
So in addition to the above advice, I suggest that when you feel the skill-ups slowdown to head over to Gustav Tunnel and fight
Boulder Eaters. At lv.100-105, they are the highest level worms, and I used these to skill up from around 335 straight to the 398 cap (I found the skillups to be much quicker). Despite not having any atma, it's still very much doable. Stand at optimal range, Roll Tacticians and Coursers, Sub /DNC and waltz off their nukes, use Dark Shot to dispel their Stoneskin, and Fire away!