Part of the reason they are so wonderfully accurate -- within their velocity range -- is because of the hollow skirt that expands to very precisely fit the bore diameter.
The hollow base wad cutter is also loaded in .38 S&W for that reason, guaranteeing proper fit in the slightly larger diameter bore.
Double end wad cutters are more common hereabouts, and are what I load for .38 and .357.
Unless I feel like loading something else. 
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