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ncwalker
The goal is to test the measurement system, not just the gage.
100% agree. I slipped in my original post and called it "gage" when it is "measurement system." For the dear readers - that means, not just the device that spits out the number, it also includes the fixturing, the operators, the consistency of the parts, and the ambient conditions. All feed into the system.
Stamping, casting, extruding and molding all might make it difficult or impossible (at least in practical sense) to create the variation necessary to include the entire tolerance range.
I agree with the practicality aspect. If it is practical to create parts throughout the range, it should be done. If it is not practical (and the things you cite are not) my response is - save the setup parts when the process is new. Even in a mold, there's usually first off tooling samples that are then tweaked into final samples to correct small dimensional errors. Those first off parts, the setup parts, heck, even the parts made outside the normal process window, are all GOLDEN PARTS to hang on to for the Gage R&R.