Yes, I have to try the patching myself. I really would not have thought a round ball patched into a hull with no shotcup would retain the patch especially during that jump from hull through forcing cone.
However, if Nobade says it works, I believe him.
It is easy enough to try too so when I get time it is on my "to do" list.
I have patched 0.662" balls into shotcups in hulls but in that case they are undersize and the patch is retained by the shotcup. That works very well for me.
As for loads, like Nobade, I have used mostly Blue Dot because I had lots. I wimped out at 38 grs. under a 0.735" RB. That was more recoil in a light gun than I needed. The 0.735" RB weighs in at about 675 grs. so a bit heavier than 0.690" RB which should be about 480 grs. in wheelweights.
Longbow