Can we talk about the time a core shift ruined a whole pour at the old Milwaukee plant?

Actually those green sand cores with too much binder are a different beast than a core shift. A shift happens when the core floats or moves in the mold during pour, not from bad mixing. I've seen a core shift on a valve body pour where the print wasn't weighted right and the whole thing lifted up a good half inch. We ended up with a casting that looked like a sideways banana instead of a flanged pipe. The tracer dye in the x ray test showed the cavity was totally off center. That kind of mistake is just gutting because its so avoidable with simple checks.