That's impressive velocity with a 100 grain bullet from a 22" AR.
I had never really paid attention to the WSSM stuff, and I found that reasonably priced brass isn't difficult to find!!
Now I kinda wish you had kept it to yourself!!
Lol! That RL-19 powder (or 17?)was designed for short fat cases to give additional speed with lower pressures. I’ll have to look when I get home.