Well **** I give up.
I got 2500 because:
Claimed Typhoon RoF: 500 RPS
Ammo: 500/500 (Clip/Remaining)
Clip Size: 500
Clip emptied in 3-5 secs in-game
If the round fired : round counted ratio (E.g. For every round fired in game, 1 is counted on the clip counter) is 1:1
The whole clip would only last 1 second because if you fire 1 round in-game it will count 1 on the ammo counter; so 500 in game would be 500 on the counter. That means that the clip will only last 1 second if the gun fires 500 RPS.
If the ratio is 500:1
Then it would mean that for every 500 fired in-game, 1 is counted on the counter. This means that it will take 500 seconds to empty the whole clip.
500 secs = 8.33 mins = 8 mins, 20 secs
That means that if the ratio was 500:1 you would get 8:20 mins of continuous fire from 1 clip. If the ratio was 1:1 then you would empty the whole clip in one second.
The correct ratio would be 500:100
If you take 5 seconds as the time to fully deplete a clip.
Because it's 500 per second in-game and it takes 5 secs to empty it and there are 500 rounds (on the counter) in one clip. So for every 500 that you fire in-game, 100 are counted on the ammo counter. So one clip actually has 2500 rounds not 500. Because 500 x 5 = 2500
*NOTE: I was really bored when I did this.