I think I identified a problem. I am used to the method I was taught, to try to swirl the melt around the opening in the sprue plate, to get an even fill out. This mould doesn't allow that, with frequent plugs forming in the sprue plate. I just measured with the handy dandy calipers. All Lee sprue holes measure between .40 and .60, (for the older one), while the biggest sprue hole in the new mould is .32, with two measuring .15! No wonder I can't get a good fill out - I can't get a good stream INTO the thing.
Does that sound like a likely villian? The sprue plate is VERY thick, .185", compared to the wider holed Lee, (that just don't SOUND right!
) is at .12". Being detached from the mould, it doesn't heat like the mould does, and being such a small hole, it freezes the melt far earlier than the mould itself does.
Of course, I might be grasping at straws here...thoughts?
Edit to add, I am going to figure this thing out one way or another, I never had a real quality mould before, and I ain't getting rid of this one!