From Testforecho (((headshots*2 + hits) / 8) + kills) * 2.5 // roughly 5 points per kill

140hp with helmet
3 headshots
3*2+3 = 9
9/8+1 = 2.125
2.125*2.5 = 5,3125

8 body hits
0*2+8 = 8
8/8+1 = 2
2*2.5 = 5

Not rewarded for even aiming at the head.

120hp with helmet
3 headshots
3*2+3 = 9
9/8+1 = 2.125
2.125*2.5 = 5,3125

7 body hits
0*2+7 = 7
7/8+1 = 1,875
1,875*2.5 = 4,6875

A bit rewarded for making headshots.

156hp with helmet
3 headshots 1 body hit
3*2 + 4 = 10
10/8 + 1 = 2.25
2.25 * 2 = 5,625

9 body hits
0*2 + 9 = 9
9/8+1 = 2.125
2.125*2.5 = 5,3125

Dont feel like bashing some heads.