As Pursuit said, stalk their website and you can accumulate it over time with no problem. Shooting it however presents a few challenges as already mentioned including voiding your warranty; similar situation if Liberty manufactured-reloads void your warranty. It's a dynamic caliber for certain. What exactly are you hopeful to do with this round that SS198 can't do performance wise, even at a slower velocity?
If the EA SM4 stuff were actually available at non-vulture prices, I guess 2,500 FPS wouldn't be so elusive out of the pistol. Oh well. I'm going to leave this up and see if that interest I thought might exist ever comes to fruition.