The problem with bottom pour casting furnaces is that the valve frequently gets clogged no matter how clean your alloy starts. Oxides will form and plug or partially plug the spout and have to be poked out from below. Lee instructions include twisting a screw driver in the the slot on top of the rod to seat the valve.
I avoid the problem completely by being a ladle caster instead of a bottom pour caster.
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Three shots are not a "group"...they are a "few".
If the Bible is the literal, infallible, unerring word of God...where are all those witches I am supposed to kill? (Exodus 22:18)