I bought 12mH [edit, that's 12 awg] coils directly from Erse. I looked to see if they still listed them before posting but did not find them. They were an oversupply closeout wound to 4 & 6 mH that I unwound to the right value. I used a meter I have on hand to confirm the amount of wire to remove. They were both below the ohm spec.
I would consider using the steel laminate core over the ferrite if you go with cored coils. I have used the Erse 16awg laminates with good results.