Maybe I'm missing something here.
From what I read on that site is it uses smokeless powder and rifle primers.
Based on common rifles (Remington 700s, Ruger #1, etc).
So it looks to me to be a rifle modified to shoot without a cartridge case with a higher price.
It shoots a 275 - 300 grn bullet faster about 500 fps faster then a 375 H&H or 300 fps faster then a 378 Weatherby Magnum.
I don't know of anything on this planet the H&H or Weatherby would kill so it looks to me the only advantage of this super muzzle loader is..................well no, I don't think I see an advantage.
I bet it would hurt though.
CPT USAR Ret
USAMU Sniper School Oct '78
Distinguished Rifle Badge 1071