Descent - 19 - Oberon Mine

I'm starting to run lower on general missile count, but I'm also clearing the levels in only a few attempts. I could probably save more ammo by dying and replaying the level more efficiently, but that feels dishonest somehow? Those projectile speeds on the heavy drillers are still catching me off guard. Damn they're fast. Continuing playthrough of Descent on Ace difficulty with no mid-level deaths or saves.