Proper shoelace cotton diameter

So I been using regular cotton for years. I recently bought 3mm shoelace cotton for my 3mm clapton coils. Is this the appropriate size shoelace cotton? Because it seems really tight using 3mm shoelace cotton in 3mm coils.

So I been using regular cotton for years. I recently bought 3mm shoelace cotton for my 3mm clapton coils. Is this the appropriate size shoelace cotton? Because it seems really tight using 3mm shoelace cotton in 3mm coils. 

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