They would work. I prefer to go to Lowes and get the felt strips they sell for weather sealing. I soak em in liquid lube, freeze em, then cut them out by the hundreds with a wad punch. The freezing makes them easier to cut, and they are compressible so one size can work for several calibers. 5/8" works for 54-62 caliber. 1/2 inch works for 50, 45, and 44. A person could probably take a 44 cartridge case, sharpen the edges, chuck it up in a drill, and cut a lot of wads that will compress nicely into a 36 caliber cylinder in short order. Of course at a buck for 75 of them, you can do a lot of shooting with the store-bought variety!