All: I just cast my first hollow base bullets. These from a Lyman 450229 mold. Just lurking I found great advice on how to deal with hollow base molds and pins. I was quickly casting great bullets. These are pure lead and fall out (no, make that, get tapped out of the mold) at .453 and exactly 125 grains. Seems a bit light to me. I was hoping for .450 so I could experiment with expansion in my vaquero, but after sizing them right at .452, they are perfect fits and barely slide through the cylinder and fit deep in the forcing cone. They may just work.
-Tuco