66 would be a more logical option. But you have the brass and are reading the heads. I wouldn't rule out either option.
A friend of mine's grand mother lived in Sibley and he enjoyed the light shows from the testing range when they did night firings.
Don't have a clue as to what a proper pricing should be. Garand shooters would be happy with it. I know that I would.
Enjoy,
OSOK
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