Most of my irons, full distance is based on about 1/2 bs. Fbs will knock about 5 yards off of the shot.
About 93/94% 1/2 bs would be about 140 of my 150, 95% is 141. FBS about 97% for 140(145-5). See right there I shot harder to shoot shorter, depends on spin you use and what ball. That is with not having to calculate for wind or elevation/drop.