only use the 64 wedge on the green, fullback spin, full shot=27 yards( depending on lvl of club and hill/wind) i have been using this and it has saved my par alot over the last two teirs. its great for jumping over the crazy hills and super bad breaks(u only have to measure the break around the cup).
i find if u put top spin on it goes around 31 yards ( watch for hill and break they can add/subtractr from total depending) dont know if this is common information or if it legal but its definatley accurate and u can measure out different yardage up to stated yards above.. good luck have fun happy hunting