I've burned a LOT of 231 over the past 20+ years.
One thing I've found is that it's not so great in larger cases. I've gotten erratic results with it in .41 Magnum and .44 Special cases, probably due to light loads and powder position.
For .38/.357/9mm/.45, though, it's about as perfect a powder as you could ever hope to find.
"The gift which I am sending you is called a dog, and is in fact the most precious and valuable possession of mankind" -Theodorus Gaza
Baby Jesus cries when the fat redneck doesn't have military-grade firepower.