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Gauges for low tunings

I play a Fender precision in an old school rock and roll band, the last strings I bought were 45-105. So far so good. However, I have now also joined a doom metal band which tunes down to dropped C (i.e. the bottom string down to A#). Using my existing strings the bottom String JUST BARELY manages the A#. I can't afford a second quality bass and wouldn't want to gig with a cheap one when I have a Fender sitting at home - so I want to use the one guitar with both tunings. Would going a little heavier (say 110) satisfy both tunings without causing problems at the nut?
 
110 will still flop around like a wet noodle. You need the lowest 4 strings from a 5 string set. Or try a drop-tuning set from Circle K Strings.

And by the way, drop C is CGCF, so you're probably in drop Bb ; BbFBbEb... Otherwise you're just in a really weird tuning.

You're never going to get a string set that can accommodate both tunings, so you're better off getting a set that can be tuned down permanently, and just learn the rock and roll songs in your new tuning.
 
Switching between EADG and A#FA#D#? The tension change is huge, almost down to half tension, this will change the curve of the neck and your action in problematic ways: low action with loose strings and visa versa. Any compromise set will be under or over-tensioned in one or both tunings. Better to switch between C standard and drop A# and design a custom set of singles optimised for those 2 tunings (i can help you with that once you decide on your tunings.)
 
The terminology doesn't make sense to me either, but I think I can see where the confusion came in -- the top three strings in the tuning being what you'd find in a standard C tuning (all 4ths, two whole steps down from EADG).

Anyway, I, like others in this thread, have a hard time seeing a regular P-bass neck accommodating such changes in tension, but MAYBE it's possible with the right strings (I mean, Michael Manring does crazy things with his Hyperbass, but I don't think even he's dropping all the strings at one time). I wouldn't want to try it with my bass, though.

If you need the low tuning with the one band and you want to use one bass, tuning to C-standard (C F Bb Eb) and dropping the low string to Bb when you need to seems the most logical choice -- the compromise with dropping one string a whole step won't be nearly as bad as dropping three of them a major third and the fourth a tritone! I don't know how hard it'll be for you to play your rock band stuff in the new tuning, though.

The only other option I see -- aside from a tuning I haven't thought of that would work for both bands -- is a second bass. You could start with a cheap, used P-bass. Over here, a decent Peavey or Squier can be found for the price of half a dozen sets of strings. Might not be as nice as your Fender, but you're negating a lot of your Fender's potential with the tuning compromise anyway.