Is there a way to make roblox calculate ammo amount?

I'm making a lever action rifle, and when you press "r" you will reload. Is there a way to make roblox do the math on how many rounds to reload, then play the reload animation each time?

This is how I do it

local currentAmmo = script:WaitForChild("Current")
local reserveAmmo = script:WaitForChild("Reserve")

local ammoToUse = math.min(AMMO_CAPACITY - currentAmmo.Value, reserveAmmo.Value)
currentAmmo.Value = currentAmmo.Value + ammoToUse
reserveAmmo.Value = reserveAmmo.Value - ammoToUse

This is just a snippet of my code, btw

local MaxAmmo = 12
local CurrentAmmo = 0

-- this is when you have no more bullets and you wanna insert each bullet

for I = 1, (MaxAmmo - CurrentAmmo) do
	print('bullet loaded')
end
-- reloads bullet 12 times