Focus Rifle Observations

Overcharging the Focus Rifle:

HUD - Value displayed on the HUD.
ACTUAL - Value stored in-game.

HUD ACTUAL      How much battery one overcharge uses:
100 100         -12.09375%
88  87.90625
76  75.8125
64  63.71875
52  51.625
40  39.53125
27  27.4375
15  15.34375
3   3.25

Looking at HUD 40 and HUD 27 value, we can see that Reach
rounds numbers as standard, with 0.5 being rounded up and
0.499 being rounded down. Even when the HUD says the weapon
has 27% left, it has more in reality. This won't have a
noticeable impact in-game, however.

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Shooting Focus Rifle each frame:

AMMO - The ammo it starts at and ends at.
FRAMES - How many frames it took to use 1%.

AMMO    FRAMES
100-99  4
99-98   6
98-97   6
97-96   6
96-95   6
95-94   7
94-93   6
93-92   6
92-91   6
91-90   6
90-89   7
89-88   6
88-87   6
87-86   6
96-85   6
85-84   7
84-83   6
83-82   6
82-81   6
81-80   6
80-79   7

Not checking further because pattern seems clear.

Going from 100% to 99% only takes four frames
of shooting whereas the rest take either six
or seven frames before the battery is lowered.
Due to how the game rounds numbers, the Focus
Rifle only has 0.5 before the HUD ammo is
lowered whereas every other percentage has 1.0.