Sounds like typical 4227 residue. WLP primers are what I use in several of my 44 mag loads, including the H4227 loads.
I agree with CW on the crimp. Gotta have a good crimp. Make sure you seat the bullet in one step, and apply the crimp in another.
Trying to crimp a bullet when you a pushing it down in the case is like trying to button your pants before they are pulled all the way up. Just doesn't work right.
Most of my straight wall pistol cartridges are crimped using the Redding profile crimp die. It works well for me.
I don't have my load data available here at work, but from memory, you are within a grain or so of my favorite 240 grain 44 mag load.
Steve
