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209 shotgun primers are a pricey option, ive not yet tried the toy caps but really like the idea. I had one rifle that used the no11 small caps which occasionally misfired unless the nipple was...

Corrosive primers are no problem with black powder as you use water cold and hot to clean so the salt gets washed out.

Capping before loading is a must imo,putting a little powder down the nipple "just to be sure" for the first shot is also not a bad idea. The no 11 is the small cap as macca49 said the top hat...