I went to WW 231 for a long time, and was happy with it, until I discovered WW 452AA (no longer made). 452AA had about the same burn rate as 231, but had a very smooth pressure curve, so recoil felt lighter, even though actual recoil was about the same as with 231, since the charge weights were nearly identical. Accuracy in most guns was as good with one as the other.
Fast Confused? Don't be. It may all look like voodoo for awhile, but it really all makes sense when you work with it for awhile, and it's FUN to play with. Well, it makes sense until you find out that 452AA had an inverse temperature response, and generated higher pressures at lower temperatures, then it makes one's head spin, or at least, mine does...