Smylee, I measure 6 ounce at about .015, and 8 ounce at .018 so you are in the ball park.
I prefer 10 ounce at .021" in all my rifles and the (.615") smoothie now, with a .595 ball.
Denim here runs just over $30.00 per meter. A meter is 39.37". 1/2 price is nice to find.
Taylor has a bunch of 8 ounce he is using in his .40's and .25, although seems to me, he
went to 10 ounce in the Kibler .40 as the 8 ounce patches were a mite thin.