I prefer to ladle pour than bottom pour from a pot. I have been using a Lyman ladle, the pour snout is tapered to help match the sprue plate funnel, and I turn the mold to it's side, place ladle in funnel, and roll the two to pour.
How does the Rowell "bottom pour" ladle compare to the Lyman in casting cleaner bullets? It appears the outlet isn't tapered to match a sprue like the Lyman, but does it pour cleaner lead that the Lyman?