Huehuehue. I headshotted with the bouncing chain lightning. It occurs to me that a real bullet (the bomblets do 1 damage and 100 piercing) with the bouce skill would anihilate a crowd, since my launcher skill is only the 4 I leveled it to actually playing the game in Witt.

^^ I would like to point out that the actual projectile only targets hostiles. I shot at Ronald on purpose.
I dont think explosive ammo can be safely used. The range of the gun is too small, the explosion flag effect is too large, and the damage from the explosion effect is considerable.
Frag rounds are even more powerful since frags shot out multiple projectiles that each act like a single bullet. Anything caught in the 2-3 tile radius of ground zero is pummeled.
Cyberdemons, with their 21 armor and 500 health, only just survived their own rockets when I was using frag rockets for them.
Acid rounds are neat. Im a fan of acid bombs in-game, and though I share the dislike of corrosives I actually like acidics and spitters. Well spitters en masses is crap, but acidics are a great way to spice up zmen. The toxic gas breaks LoS and might piss off organic nonzombies.
stun rounds are perhaps the most reliable bomblets I tested. They usually arent so inaccurate as to affect you, they have a large radius, and they affect everything. When wielded from a holster it could perhaps be quicker than using an actual flashbang. Which is great for crowd control.
shock ammo is the most fun, hands down. Not relaly enough damage from lightning alone, and I dropped the plasma effect because I couldnt justify it.
So overall I would be happy making this ammo into part of the mod. As a short innaccurate gun or as a mod for a larger gun.