You can make your own nitrated paper. The trick is to get something which is linen based (no plastic, yes, there's plastic in some of the fancy modern paper) which is thin enough to combust quite readily (or be ignited by your musket cap) and is strong enough to be handled.
I'll post later when I find the address of the chemical supply house I purchased my potassium nitrate from. BTW, shop around on the web and you may do better.
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