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USBC indicates it will implement 73D minimum hardness with ball testing for slow oil-absorbing bowling balls for some national events

The report states that only about 1.1% of the 78D balls USBC has tested at its events this year have tested under 73D.
USBC indicates it will implement 73D minimum hardness with ball testing for slow oil-absorbing bowling balls for some national events
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Jul 09, 2026