Hey, guy, it always "DEPENDS" on 3 or 4 thousand factors. Slight modifications of a ball's surface or even a re-drill (wait until you throw it on a few different oil patterns, a few times each before you "jump the gun".) is no big woop. 9 times out of 10 even the best guess wrong.
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Just like hand grenades and horse shoes, in bowling you only have to get close ...
CharlesT