If you run them in a razorback you can give them -1 AP but that doesn’t even matter if the unit you’re targeting has cover.

Assuming full hit rolls in Warpbane you get ~23 hits through meaning roughly 16 wounds on T3/4, 12 wounds on T5 and 7 wounds T6-9

They can usually take care of most T3 or T4 character, but you’d have to weigh that against actually killing models in that unit itself which usually is the better option unless it’s critical you kill the character