One material Jo-Anne's sells is Denim by the ounce weight,. ie: 8, 10, 11, 12, 14.
While in Arizona a few years back, I went into the Jo-annes in Yuma and they had several of these 'weights'.
I find the 8oz a bit light, but the 10 ounce shoots well in every one of my rifles and the smoothbore, with appropriate ball diameters.
I use the 12 and 14 ounce in my .69, again, with appropriate ball diameters.