Over powder patch questions

I have a tc renegade 50&54 cal. I have never used a patch over powder. I watch your videos on it and have some questions. Using a ball should you just use a regular. 18 patch? Or a heavier wool patch? Or just use the wool patch for conicles?

I don't think Idaho participates here anymore. I use a patch cut from cardboard egg cartons for my hunting loads to keep the patch or bullet lube from leeching into the powder charge. I can not remember if the purpose of Idaho's patching was for that purpose or to protect the bullet. I will guess the latter.