I've used the bottom pour method of filling a mould for years be it a single or four cavity mould. I broke down and got the Lee Magnum Melter and thought I'd try my hand with the ladle. As for single cavity heavy bullets like the Lyman 457125 or the Brooks' 530 gr Postell bullet this method excels over a bottom pour as far as I'm concerned. The weights are much more consistent that what I was getting with the bottom pour method.
A highly recommended item it you haven't tried it yet. It took a while to even want to try the ladle method but now it's quite enjoyable and I don't have to sort out so many different weights. Moreover, the finished product looks superb.