They've made Black Hammer not worth having!
Nerfing it would be doing something like:
* reducing its stability so you are less likely to get the 3 precision hits necessary to trigger the Whitenail effect
or
* introducing a percentage chance that - even when triggered - Whitenail - may have no effect
or
* simply decreasing its damage.
But with such a small ammo reserve, what Bungie have done is make Black Hammer not worth the vault space. It's ruined.
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My main problem with the nerf is that when you do the calculations, a fast reloading sniper combined with the triple tap perk will give you more dps at only a tiny bit of a slower speed, meaning the black hammer is now beaten at its own game, especially since it has mulligan.