yeah yeah i know its been covered 100 times. believe me, i've been up and down google and every forum available for the past few days. cannot find a straight answer.

I need a 100' extension from my dryer outlet which is 230v30A
to my machine.

10/3? or 8/3? or 6/3?

I know how to wire it, i know what plugs and receptacles i need, I know I need SOOW flexible strand AWG etc.

thanks in advance for the assistance.