String Gauges For Custom-scale Eight-string?

[Prostheta]

Hmm. Well, the eight-string i've got underway is designed around being a 30" scale tuned F#BEADGBE. I prefer 10-46 sets on my "normal" guitars in standard E, but I have no immediate idea on how to calculate string gauge based on a crazy-ass scale and low tuning. My gut tells me to try out a 12-56 set for low B through high B with an 8 on the high E and a 66 on the F#. I presume the change in gauge vs. open string tuning would require the D/G/B/E strings to be plain as opposed to a wound D.

The other worry I have is actually getting the string to fit through a normal strat-style saddle as the bridge I have is the Hipshot eight-string bridge. I can't see it being an issue hugely although I might have to round over the saddle transition a little due to the heavier wind and possibility of unravelling.

Any methods of working this little paradigm out would be greatly appreciated as I would be using the hit and miss method otherwise, and that means lots of wasted strings!

[erikbojerik]

Google "string tension calculator"...figure out which gauges at your normal scale length and tuning you prefer on your 6, then change the scale and tuning and tweek the gauges to shoot for similar string tension (on each string) as your 6 tuning.

[Canuck Brian]

I've got the same bridge you've got and I use a .60 gauge for my F#. Fits perfectly without any force and sits nicely in the saddle.

It does not however, like going thru the tuning post. That takes a little convincing.

[Prostheta]

I thought as much. I was hoping that the longer scale would allow me to use a slightly lower gauge. That said, I still haven't committed to 30" yet so 27" might still be on the cards.

I remember reading your build thread a while back. Awesome instrument! I didn't even realise that you'd made a 100% purpleheart neck till I looked back on it again this morning.