Second cap and ball. or black powder in general. It might not be practical for many modern applications compared to other firearms, but black powder is SOOOOO much god damn fun. And cheaper than some other modern calibers, per shot. And if you hunt, black powder in many states gets a much easier start date and a longer season length than modern firearm hunters.
They are much fun ... and they have so many powder options nowadays, it makes it even easier.
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