There will certainly be huge variation in results. You also have to know what they were actually shooting at.
Technically, anything over 40' wasn't listed by ONI as a "sampan," but might be a "lugger."
I see sampan, and assume it's 20-40 tons. All the ONI "sampans" looks like the small river craft of the same name you are familiar with from movies like Apocalypse Now! It did unfortunately become a generic term, even in regions where no such craft actually existed.
Closing to 100 yards certainly makes it easier though.
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