That's a pretty stiff load. I would load a few and check for excessive pressure signs. I reread this thread and I don't see the diameter you are using. I'm using .452. I also didn't see anything about seating depth. I used WSL1 years ago, an old Winchester shotgun powder. I don't remember if they quit making it but I did switch to Clay's, and one of the reasons was how well it burned. Sent from my SM-G970U using Tapatalk