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George, I just cast some 451 balls from a Lee mould the other day, still had them laying on the workbench so I was curious and measured them. If my dial calipers are accurate, they measure between .451 and .452. At the sprue they measure .441. I gotta say I was surprised because the flat of the sprue didn't look big enough to take .010 from the diameter. I dropped one on the concrete floor of my shop ( I have a wood stove in mine, George, 17 degrees here today) until the flat from the impact was the same as the flat from the sprue. If you want to see how big the sprue cut will be from a Lee mould, take one of those .451 balls and drop it on smooth concrete from 5 1/2 feet.
I just love precise science!
Steve
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