Well guys, here's another variable -- the furnace itself.
For years I limped along with the leaky, recalcitrant Lee El Cheapo bottom-pour pots, and was plagued by these voids. Pour fast, pour slow, tilt the mould, hold it level -- no matter the variation I tried, I got bubbles.
Then, last year I had enough with the Lee furnace, and plunged for an RCBS bottom-pour furnace. Voila! No more pockets!
Why? Got me. I can't think of a good reason, other than the facts that the RCBS spout doesn't get leaded up like the Lee does, or the heat seems more consistent. All I can go by is the result, and the result is no more holes.
Jim Strang
Gen. W.T. Sherman's Bodyguard
Midwest Region
"I think the Union army had something to do with it."
― Gen. George Pickett, years afterward, on why his charge at Gettysburg failed.
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