I use all sorts of guages when doing Ni200 builds. Twisted 30, CLaptons, regular 28, etc. One thing that stays the same in all of them though is what I wrap around. I use a #6 machine screw so I can get even spacing and work it onto my atty without losing its shape. Works like a charm. Right now I am running dual 30ga, 10 wraps arounf the 36, and right at .1Ω in my Mutation X V3. Works like a charm.