so.......
After reading stuff and reading stuff and watching videos and reading more stuff, I came to the conclusion/assumption that Callahan shots are weak(under powered) and is not good as a sidearm. I hear it only does around 120dmg per shot in FSC against zombies without gunner equips/trinkets/UVs. And the only use, from the stuff I read, seems to be hitting devilites, healers, and wolvers(T3). Blitz seem to beat it everywhere else.
BUT, it does seem to be great at PVP (personal experience and reading stuff) due to its fast shot and stun.
I can see that Callahan isnt a great DPS gun as Blitz out dmg it, and for swordsmen, BTB or FF would probably do more dmg anyways(and its safer).
What Iv read in almost every post in the fourm is about the crap DPS/solo/Pure gunner aspect of Callahan. What I havnt read, is the support side of this gun.
So my question to Callahan users is this:
Does the gun do enough(dmg, interruption, status, etc) for it to be worth grabbing for a non-gunner party player OUTSIDE PVP?
Callahan is useful for making Howlitzers, devilites, regular wolvers, and gremlins flinch. That is, unless you have too many people in your party and the knock down fails to be enough to do so.
Generally, I'd say that Callahan isn't a good choice for non-gunners and you'd be better off with a rapier most of the time. The only enemy it really helps against comparatively are devilites.
EDIT:
Thanks cake for the correction.