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Hatcher's Notebook lists this primer composition which was used by the U.S. military about 100 years ago - Sulphur 21.97%, Potassium Chlorate 47.20%, Antimony Sulphide 30.83%.
The biggest problem was that Sulphur would react with Potassium Chlorate in moist climates and eventually degrade the primers. A person could add a trace of antacid (sodium bicarbonate?) to reduce this problem.
I have made #11 caps with the Tap-O-Cap tool, using the igniter tips from "strike anywhere" kitchen matches - separate the tips from the matches with a razor blade, and glue them into the empty aluminum shells with a droplet of nail polish. If I'm not mistaken, these igniter tips are Potassium Chlorate compounds.
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