Wilt Chamberlain has the highest eFG% with 50+ games played and 10.0+ points per game in a season, at 72.7 percent in 1972-73.

highest effective field goal percentage in a season with 10 ppg and 50 gp
Interpreted as:
highest effective field goal percentage by a player in a season with 10 or higher ppg and 50 or more gp

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