Filter Torroids Question

The torroids from Hosfelt arrived today (item T-250-B).
My question is, has there been a discussion or consensus
over what type of wire to wind these with?
Without a lot of thought, I fit 20 turns of 12ga solid
THHN house wire on one of them before realizing that the
wire is only rated at 600v.  If anyone wants to know,
this measured out at exactly 80uh with the LCR meter.