I'm working on upgrading my 3* gear up to 4* as I prepare to enter T3, and I'm wondering which piercing gun is more useful. I know that the blitz is really handy for FSC, but how useful is it in other areas, and how effective is it when used on devilites and wolvers? Does it do better than callahan?
Edit: I forgot to mention that I'm a sword/gun hybrid, so I also use the flourish. His well do the piercing guns stack up against flourish-line weapons, given that wolvers and devilites don't try to dodge melee attacks?
From a gunslinger standpoint, Blitz is superior over Callahan in almost every situation, the few places I can think Callahan would be better is with Devilites and Greavers, but even that's a stretch. Become skilled enough with Blitz using proper positioning and timing to instantly massacre anything in it's range and you'll appreciate it more than Callahan's mediocre damage and crowd control. I've tried to like Callahan, switching it out with Blitz here and there, but in Elite mode things just don't die fast enough to warrant use over Blitz so I switch back after a depth.
When you have enough funds to have both, you'll notice that rooms of wolvers will clear much faster using a Blitz rather than spend 5 minutes doing a little dance with Callahan. If you want to stay safe instead of risking your life Vs. Devilites and Greavers, you could use alchemers as an alternative which I feel also surpass Callahan due to ricochets and easy kiting, or using the Flourish/Snarble Barb line if you're into swords.
Really hoping Callahan/Iron Slug is buffed one of these days, I want to love these guns.