If you go to Wally World and get their 100% cotton pillow tick, blue or red stripe that material would work just fine for you.

That is some outstanding shooting there. These big bores are a lot of fun. I really enjoy shooting them. Especially into non paper targets like cans and stuff. I have a bunch of old paint cans I might fill with water and then hang in trees back in my woods then have some friends over for a woods walk.