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813 monme (匁) is about two-fifths as heavy as a Bowling Ball.
In other words, it's 0.4480895480 times the weight of a Bowling Ball, and the weight of a Bowling Ball is 2.231696780 times that amount.
(most common selection among male bowlers)
With an allowable range of 1,330.537620 monme (匁), the most-preferred bowling ball weight among adult, male bowlers is 1,814.369480 monme (匁). Because regulation balls measure the same diameter irrespective of their weight, ball density varies by size and balls weighing less than about 1,333.333330 monme (匁) will float in water.
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