I use it after cutting down hulls that I will roll crimp. It removes the burr from the inside of the hull and bells the mouth a bit, allowing the wad to slip right in. It also "reconditions" the mouth of roll crimped hulls after being fired.
I think the thinned hull mouth starts to roll over quicker making a nicer crimp.
Originally, when hand loading hulls with fiber wads in a push tube loader, the skived hull mouth would help prevent the wad catching on the hull mouth, cocking or breaking the wad.
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 "Double guns are a sport and a pastime built into a beautiful package to which I attach myself when entering the great theater of autumn, those days now grow more precious because we are given so few".. Robin Lacy
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