W231 is a VERY versatile powder, which can be used for many calibers. If I had to pick one powder, W231 would be it. I use it for .38 special, .357 mag, 10mm, .45acp, and .44 special.
It's the only powder I buy in 8 lb kegs.
"If the sole purpose of handguns is to kill people, then mine are all defective." - Uncle Ted Nugent