My tuning has slowly been getting lower and lower over the last few years. It started with getting into 7strings and having that nice B. I was happy.. for awhile... but it soon went down half a step and so on. I'm now a step and a half down in C#std with my lowest string being G# it's gone hand in hand with the music that I've been listening to. No, not Djentmathcore - Sludge/Stoner/Doom/70s revival Physc... ad nauseam. I know Suffocation and Iommi like C#.
Generally speaking, I like 9-46+60 set in standard tuning on a 25.5" scale with about a 3mm action.
I'm pretty happy with the set that I've made up using this brilliant thing
http://www.mcdonaldstrings.com/stringxxiii.html here's what I've come up with
25.5"
E .009" =5.62 E .010" =7.49
B .011" =5.05 B .013" =6.83
G .016" =6.76 G .017" =7.56
D .026" =9.29
A .036" =9.8
E .046" =8.78
C# .011" =6.35
G# .014" =5.72
E .019" =6.94
B .032" =9.72
F# .044" =10.32
C# .056" =9.6
It's pretty damn close, eh? The Gstring feels all manner of wrong, though. Not sure if I should explore a wound third or just bump up the gauge to a 22p. Anyone use wound thirds? And the 66 on the 7th string is a bit floppy. But it's all getting a bit spinal tap.
Best go do the washing up I guess 8)