I started bowling in 1973 back in college. I shot my only 300 in 1997. I was averaging 193 at that time. It was a notoriously tough house to get a 300 at that time. I think only 9 were shot that season across all the leagues. I missed the pocket once that night, and didn't have an open frame. The thing that killed me was that I didn't break 700. The games were 198 - 300 - 199.
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