. Colerain barrel , is the rifling radius or square ?
IMO I would start with at least a .015 patch and .530 ball
Mic you some blue pillow ticking . Depending on the ticking I have found it to range from .015 -.020
Since you family quilts , you should have a ready supply of that .

Myself I find the .535 balls alittle hard to load with that thickness of patch . So you might want to drop down to a .010 patch . However depending on your powder charge . That maybe to thin and you lose patch integrity. So it�s a give and take .
Frankly , I see no need to have to hammer a ball into the bore when there is a marginal difference between an easier loaded patch ball combo and a harder to load one .

But in the end , as other have said , you will need to get out and shoot to find out what patch , ball , lube and powder charge combo works best for your barrel

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