I go to the local fabric store and buy cotton flannel by the yard. It's usually about 2.00 per yard and is about 40" wide. I then purchased one of the circular roller cutters for cloth (9.99) and can cut them any size I want. I shoot mainly shotguns so I have a special size for each of the 4 gages. Same principal would work for rifles and handguns, a size for whatever caliber you shoot......
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