1967 Canadian 800 or 500. Is "ring test" only reasonable way to tell?

The only real pieces of advice that I have heard are as follows:
1) You always have to buy it as 0.500 to cover your butt
2) You compare the "ping" to known 0.800, as opposed to know United States 40% such as a 1966 Kennedy Half Dollar.
Anything other advice would be appreciated.
Greg
1) You always have to buy it as 0.500 to cover your butt
2) You compare the "ping" to known 0.800, as opposed to know United States 40% such as a 1966 Kennedy Half Dollar.
Anything other advice would be appreciated.
Greg
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