Halberd weights way more than Tiger's club, so it cannot be expected to be swung nearly as fast.

10 m/s is perfectly reasonable, some 7-9 m/s is pretty typical for fully committed punch of trained boxers. Halberd head has a lot of advantage in velocity due to leverage, but with it's mass and arms moving way slower holding the haft, being close to body, it's shouldn't beat those significantly.

Momentum of halberd also is perfectly simple thing:

Bullet of 8 g and velocity of 400 m/s will have energy of 640 J and momentum of about 3.2

Some simple model of halberd with about 3kg of whole weapon and hand moving about 12 m/s on average will be 216 J with momentum of about 36

Of course, there will be subtleties in it, but generally, due to way lower mass, and energy due to great velocity, bullet will have way lower tendency to stay on course, it's energy will be likely spent up for many other interactions.