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813 monme (匁) is about two-fifths as as a Bowling Ball.
In other words, it's 0.448089548 times the of a Bowling Ball, and the of a Bowling Ball is 2.23169678 times that amount.
(most common selection among male bowlers)
With an allowable range of 1,330.53762 monme (匁), the most-preferred bowling ball weight among adult, male bowlers is 1,814.36948 monme (匁). Because regulation balls measure the same diameter irrespective of their weight, ball density varies by size and balls weighing less than about 1,333.33333 monme (匁) will float in water.
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