Any drive over 400 feet is noteworthy. A blow of 450 feet shows exceptional power, as the majority of major league players are unable to hit a ball that far. Anything in the 500-foot range is genuinely historic. For perspective, consider the computerized measuring system implemented by IBM in most major league cities in 1982. By 1995, the sponsorship had changed, but the program had been expanded to include every big league ballpark. During those years, only one drive of 500 feet was confirmed by this system. Cecil Fielder of the Detroit Tigers is credited with powering a ball 502 feet in the air over the left-field bleachers at Milwaukee's County Stadium on September 14, 1991. Such renowned sluggers and extraordinary physical specimens as Jose Canseco and Juan Gonzalez have never come genuinely close to the 500-foot threshold. The best effort on the part of either player was Canseco's famous blast into the fifth level at Toronto's Sky Dome during the 1989 American League playoffs, which was estimated at 484 feet.
Not surprisingly, all of the great true distance hitters have also been the source of the greatest exaggerations. Despite his extraordinary accomplishments, Babe Ruth is not immune. His tremendous blow to right-center field in Detroit on June 8, 1926, has often been reported as traveling over 600 feet. Certainly, this drive was propelled somewhere around 500 feet in the air, which makes it legitimately historic, but proof that it traveled 600 feet cannot be found. When Mickey Mantle cleared the left-center-field bleachers at Clark Griffith Stadium in Washington on April 17, 1953, the entire baseball world was lead to believe the ball had traveled 565 feet from home plate to the point where it landed. In truth, that figure derived from the distance from home plate to the place where a neighborhood child retrieved the ball. Since this home run was the only one that ever cleared those bleachers during decades of major league and Negro League competition, it is genuinely deserving of recognition. However, the actual distance in the air was probably about 510 feet. The same process was at work for Mantle on September 10, 1960, in Detroit, where his right-center-field rooftopper was reported to have traveled more than 600 feet. From interviews with the surviving source of the original data, it is readily apparent once again that the all had bounced several times before it reached the estimated distance. Included among the other great exaggerations in the history of tape measure home runs are Dave Nicholson's Comiskey Park rooftopper on May 6, 1964, and Dave Kingman's Wrigley Field blast on April 14, 1976. In the case of Nicholson, who was a powerful man, as was Kingman, the figure of 573 feet was provided by "White Sox mathematicians." These unidentified individuals based their calculations on the assumption that the ball traveled completely over the left-center-field roof. however, subsequent investigation indicated that the ball landed on the back of the roof before bouncing into the night. When Kingman launched his wind-aided blow in Chicago, The New York Times somehow concluded that it had flown 630 feet. It has been confirmed that the ball struck against the third house beyond Waveland Avenue, which is situated about 530 feet from home plate. Yet again, we have an example of a genuinely epic home run that has been grievously overstated.
Source(s):