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Yes. Half the thickness of the cap metal enclosure, about 0.02". Or so.
However, most of these replica percussion guns are not made with anywhere near the precision necessary to achieve that considering the tolerance stackups between the hammer size and location and the nipple/cylinder sizes and location. Keep in mind some small amount of cylinder end play is required also to prevent jamming the cylinder and achieve a minimum distance between the end of the chamber and the barrel forcing cone.
Original percussion revolvers were hand fitted to ensure the tolerances came together to result in such clearances in the hammer/nipple area, bolt/cylinder, cylinder/forcing cone, etc. With enough patience and a good set of stones and needle files, or a big box full of spare action parts, frames, nipples and cylinders we can also.
Or, a better, or rather easier, idea is to just not dry fire the gun. I believe most tutorials and texts on learning to shoot bp contain such a statement.
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