The original American .22 was developed by S&W in 1857. It had a 30grn bullet with 4 grains of black powder. Today, we know this round as the 22 short. In 1878 the BB cap was introduced. It was round ball with no powder only the priming mixture. The CB (conical ball) was introduced in 1886. It was loaded as I stated above with 2 grains of black powder. The .22 rimfire CB is still available.

Pete

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