tuning guitar

does anyone think the action on a guitar droped to drop C is kinda sucky? when i drop i use beefy slinky strings. 54 is the lowest string (C). im gunna drop an rg550 to drop C. i got to tune the whole guitar now its goona suck it takes forever. the two big screws in the back, i forgot do you...

I want to drop tune my guitar and i'm wondering which is the lowest tuning one can achieve.8)