That entirely depends on how many he killed at the battle of the Tower and during the year timeskip.
It would take Wax 2-3 bullets to break a section of plate, going all out. So that's him tapping weight and pushing on the bullet.
If he uses those bullets Kal throws down a reverse lashing and is unharmed, if he uses aluminum bullets so that they can't be affected by reverse lashings, then it requires more shots from him.