Ok first we need to be clear about the question.

Its meters per mm so its 475 yards of 30 # mono.

(435 meters is 475 yards)

Lets assume you plan to use 50 pound mono.

[Berkely big game 50 pound braid (.55mm) is equivalent to 12 pound mono.]
A little math is necessary here.

Using the capacity of the senator-113 at 475 yards for 30 pound mono.

50 pound mono

[using your numbers (reasonable)] -- .70 vs .55

The difference in diameter is .15mm.

So if you multiply .15mm x 475 yard you get 71.25 yards.

Subtract the 71.25 yards from the 475 yards and you get your answer.

Seems reasonable.

403.75 yards.