Updated after real-world testing. Weapon recoil isn't high and doesn't require [Steady Hands]. [Targeting Subsystem] for more accuracy while sniping or [Spry Sights] for more John Wick style action are advised.

Note that Overframe doesn't appear to do the DPS math correct with Cannonade mods (and most Arcanes), suggesting and favoring inapplicable Fire Rate buffs. SEMI weapons are one-and-done when built this way.

Blast damage is used here because it's exceptionally potent after u36 and will trigger this weapon's ammo efficiency gimmick on collateral targets. (Gas and Electric can also do this). However, the blast shockwave tends to decimate entire groupings of enemies with a single headshot within the cluster.

Multi-status, Fire Rate builds with this weapon are good but are mostly leveraging the simplistic rate-over-time math of this platform.

EDIT: Should you choose to use Gas, simply swap [Semi-Pistol Cannonade] into the [Deep Freeze] socket and replace [Deep Freeze] with [Pathogen Rounds]. No extra Forma needed.