When I measure ticking- some pillow, and some " mattress"--- at Walmart a couple of years ago, they had 4 different kinds of ticking available. The color of the stripes told me NOTHING. Measurements varied from one bolt to the other. I do remember that two different colored stripe ticking measured the same thickness.
I went to JoAnn Fabrics here, and withstood the stares of the biddies, while I used a micrometer to measure Ticking, denim, linen, and muslin. I think they had two different thicknesses of denim, just one each for the muslin, and linen, and 3 different thicknesses for the ticking. I bought a yard each of Blue and Red striped ticking to try with my new Fowling piece. I still have some pre-cut patches in different thicknesses, and may have some strips of ticking I bought in a box somewhere. I do think I have enough different sizes that I will be headed in the right direction when I test my RBs in this gun.
For new readers, all this sounds like a royal PITA, and it is. But, its part of the FUN of learning what works in a new gun. Sometimes you get lucky in the first test, and you are ready to adjust your sights to zero them at a chosen range. More often, something isn't right, and you have to sleuth it out, fix it, and change components.
If you don't own your own copy, Contact Dutch Schoultz and buy his Blackpowderrifleaccuracysystem for about $20-25.00.
http://www.blackpowderrifleaccuracy.com/
You will learn to read your spent patches, so that you know what is happening in the barrel every time you pull the trigger. That and an inexpensive Chronograph are the two tools most useful in determining your best loads. Then its up to you to perfect your own SHOOTING SKILLS to shoot small groups on the targets. If you don't understand and have mastered the basic fundamentals of shooting a rifle- particularly off-hand---- then all the accuracy any gun can give you will be wasted.
NEVER pass up the chance to talk to the top shooters wherever you are, or to seek out their advice on what they see you are doing wrong. They may not be right, but you will learn much from such advice, one way or the other. Most shooters WANT TO shoot with other good shooters, as the competition is what makes them even better shooters.
If you have a chance to take shooting lessons with any kind of gun( pistol, shotgun, rifle) take the training. So much of shooting any different kind of gun transfers over to other disciplines very well. Shooting a gun is Not a Natural Thing to do. It takes practice, and training to learn to do it well.