Fifths tuning, string breakage

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I use the Guitar Craft tuning (CGDAEG), and I use an .011 on the 
acoustic, and a .010 on the electric. I haven't had breakage problems on 
the high G.  The A on the acoustic is the string most prone to breakage 
in my experience.  When it does break, it always breaks at the tuning 
machine.  I use Sperzel locking tuners on the electrics, which puts fewer 
turns around the post, which may contribute to longer string life for 
high-tuned strings.

Travis Hartnett