Strategy:Demolition ammo
From DoomRL Wiki
Demolition ammo often appears, at first glance, as an exceedingly underwhelming assembly, especially considering that it's a 4-mod master assembly, and involves a rare modpack.
On further study, though, demolition ammo can be an incredible assembly, albeit not for pumping out damage.
The most obvious strength of demolition ammo is the ability to destroy corpses, which can be of extreme importance on nightmare difficulty. In fact, to a character spending traits in son of a gun, the ability to destroy corpses in 0.1 second makes nightmare basically into an easier version of ultra violence (nightmare's increased powerups, ammo drops etc).
The second strength of demolition ammo is the knockback: fire damage has a much stronger knockback than bullet damage, making this a great defensive trait when being swarmed.
Last, targets standing next to a wall can be damaged without passing a to-hit roll. When using intuition, tracking maps, or other means of knowing the position of a monster, this affords a player the ability to kill targets outside of LOS with ease.
All together, these traits make demolition ammo one of the absolute best pistols available, and learning to harness them can make a firestorm mod go from a relatively disappointing rare modpack, to a game-changing boon, even for characters that otherwise wouldn't look twice at a pistol.