It is a heck of a trick shot.... maybe not as good as in the old westerns when they rode out of town at a gallop and shot the telegraph wires in to from the back of the horse.... Now that was trick shooting :)
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Or splitting a slug on the edge of an axe to break two (one each side of the blade)eggs.....some claim to have witnessed same.
I have done this with a pellet gun and a kitchen knife, clamped in a vise. It cuts the lead pellet cleanly in half, with the two halves of the pellet diverging as would be expected.