24 by Dirk Nowitski
jj reddick 72
i think Michael Jordan
yes, the weight of a basketball does affect free throws because while shooting a free throw you have a routine for every opportunity of shooting a free throw and if have a basketball that has different weight then your other basketball then you will end up short or long.
The most I have heard of is 51-or 52 by Brad Redford.
FTM = free throws made FTA = free throws attempted
206 FREE THROWS
18 made free throws / 90 attempted free throws 18/90 = 0.2 Success in making free throws = 20%