.70 or higher is a must if you don't want your low A flopping around. A set of 13s will cut it, especially on a proper baritone, but I'd try to find a heavier string for that low A. Are you playing this on a bari or normal 6-string?
Quote by Nightfyre
.70 or higher is a must.

nah, I'd say 0.62 or higher is a must
Brigadier of the 7-string legion. 7>6

Fender Telecaster
Schecter Damien 7
Engl Fireball
.62 tuned to low a on a 25.5" scale guitar will be floppy as hell. You can't hit it with any power or it'll a) go out of tune and b) buzz.
i have to agree on the 0.62.. depens on how floppy you like your strings..
IMO floppy is good for rythm while tight is good for solo
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