I read that the Minie balls were unlubricated.
If you want accurate shooting of a Musket, your Minie cannot be smaller than 0.002" than the bore. I can drop my Minie's in my Muskets, and hear the wind whistling out the nipple. Sounds similar to a horn pipe. With black powder, use lots and lots of lube. I fill the cavity of my Minies with a mixture of 50% beeswax and 50% crisco. I fill the grooves with grease. I adjust the mix according to outside temperature, even though, as I wrote earlier, I read that in the CW the issue ammunition was not lubricated.
The best shooting Minies were Rapine Molds, used with 50 to 60 grains of Black powder. I never tried thicker walled Minies, Rapine made his for accuracy and they have thin skirts. I also never made paper patched ammunition, you can do that if you want.