If you have [b]sealed ahamkhara grasps[/b] and get down to the [b]final round[/b], use your melee [b]on someone hostile/mobs[/b] to refill your ammo. You'll keep the bonus damage and not have your health drained.
Edit: you have to land your melee not swing in the air.
Edit: video is up
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Weekly update: fixed a glitch with the Tom that allowed bonus damaged without losing health, changes accidentally effected the mythoclast.