Chupa,
Just a note to avoid confusion, you posted “000 Buck” and that isn't what is in any 20 gauge shell - the proper nomenclature for that load is Number 3 Buck. There is a huge size difference between 000 Buck at .38 caliber per pellet and No. 3 Buck at .25 caliber per pellet. I’m not trying to nit pick, but to prevent any confusion for the poster.