[TCML] Smallest gauge magnet wire for Secondary?

[<ConorPerry@xxxxxxxxxxx>]

Looking at the price of copper wire makes me dizzy.  I'd like to build a 8"-12" secondary coil now.  When I work out the calculations for aspect ratios for tight wound secondaries the copper size ends up between 19-22 gauge.  1000 wraps of a 8" diameter form is about 2100 feet, 12" diameter is 3140 feet.  That's alot of copper!

I'm not worried about the winding process, setting up a rotary encoder and slave stepper motor won't be a problem.  So, ignoring easy to build tight windings ... what's the smallest gauge that's realistic?
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