Daryl..........Don't you use the 10oz too? I thought you said you did in a PM. If you do, what does it measure? I don't have a way to measure it.
Yes I use 10oz denim as well, but not in the .69. It likes thicker patches. The 10oz. is/was used in my .32 (barrel given away), .36 Rice square rifling, .40 Goodioen (sold), .45
GM, (sold), .50 Getz rounded rifling and the 20 bore. I use 12 and 14oz., in my .60, with either the 15 bore, .675pure or .677"WW balls or the .682" pure lead balls.
I have experimented with a canvas that measures .022" across the weave in my calipers, that is harder loading than the 10oz denim, but it is not as accurate as the heavier
patching when tested for accuracy at 50 yards, in the .69. As you can see by the test targets, the thinner canvas went about 1-1/2" for 4 shots (fouled) while the heavier patching plunked 4 fouled shots into less than 3/4"- rested, of course.
As to oz. vs. thickness, I make 6oz about at about .012/4"(which I find useless for any use, except for blowing my nose), 8oz at .018", 10oz. at .022/.0225", 12oz. at .030" and 14oz at .034".
These measurements are with the compressed jaws (finger and thumb) of my Hornady calipers.
These measurements are in the middle of my 3 sets of dial calipers.
All of these calipers give identical readings on hard objects, but range .001" apart (range of .003") when measuring materials.
I assume this is due to slightly different width of the jaws.
I like to size my cleaning jags, to use a doubled thickness of flannelette I purchase just for cleaning my guns. As it takes only one patch to clean, and 4 or 5 for drying and oiling,
a few yards lasts a long time - years & the material is inexpensive, compared to patch materials.