The given points are just for shooting the flesh of, this was the idea behind this. But as i read this i notice myself this is a very strange approach to give points only once. That said … I would also shoot till the dismembering happend because getting points then makes more sence.
At the moment i try to find a better way. Maybe two phases. First: shooting the flesh of and break the bones, Second: simple dismembering the part. As i build this it sounds so good to me, but it is really nothing that work well the more i think about it.
Still testing if flesh and/or dismembering only give points. But this is the most obvius way to see you dont get more points, simply because there is nothing more to shoot at 
@TechLord the problem i have at the moment is how i will use this all togehter, deforming sounds perfect but as you only need 2-3 shoots at max normaly to kill a zombie. You would never really see this even if i can make it work. I think i should stick with the total unrealistic but clear to see hitpoints.
I get some feedback about this and what people like the most is the headshots. Everbody love aiming the head in such games. I need to find a bridge between the gamemodes, isnt as easy as i thought.
Doing both and make what i have and then the deforming on top would end up in a nighmare to keep track and i guess also with performance.
But i think this happens if you change to often what you do. But i will test this more to see if it can be done at least (with my knowledge of course). Would work great with a first/third person game later then where you can take your time to inspect this close.
After finishing the test for the 2 phase dismembering i have in mind, i will update this post with a video how this looks then.
And thank you to both of you for the input again 