What are the best bass strings to tune down to drop C?

I'm using GHS Bass Boomers now and have so much truble tuning to drop C any suggestions on what I should use?

What are the best bass strings to tune down to drop C?
I use GHS Progressive bass strings


The E string is made little different than a regular E string


It's made to keep from losing lows off of the E string.


I've Been using them since 1992.


try 'em, you might like 'em.
Reply:ernie ball hybrid