I would hope .0001%. In other words a statistical outlier. My only basis for this response is that the sizing process ought to be easy enought to objectify with precision instruments and min requirements. Therefore, human error should be the only uncontrolled variable. I suppose folks who submit more than I do, could speak more authoritatively on this topic.
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Nick
1955 Bowman Raw complete with 90% Ex-NR or better
Now seeking 1949 Eureka Sportstamps...NM condition
Working on '78 Autographed set now 99.9% complete -
Working on '89 Topps autoed set now complete