.004 taper is total taper for the limb. it can be achieved with two tapers or a combination. I think .003 is about tops for a longbow with a good amount of r/d. but now we get into hornets nest. many guys would use a .004 taper with a tip wedge or a power lam there are many many options to use. myself, i make a mild r/d longbow with a .002 taper and a classic recurve with a .004 taper. both shoot pretty fast and are truly stable. at least i have had no complaints. at some point you have to ask how fast does an arrow need to go till we are satisfied. BTW i work in Garland.