Most "target" bows do have a longer A2A, as compared with "hunting" bows. Target bows also have more mass to them - the thinking being that it's easier to hold bigger heavier bows a lot steadier than lighter shorter ones.

Also - target shooters use lighter arrow set-ups and gain a wack of speed that way. They typically shoot 60 lbs or better and with the lighter arrows, they attain speeds in excess of 300 fps on a regular basis.

Makes for close pin gaps and also lets the shooter use fewer pins.