I believe that 1200 fps exceeds the velocity of a 200 grain 40 S&W, .45 ACP, or (more critically) the .357 Magnum. I think 1000 fps does to by a handy margin.
So there should be real and large issues with pressure, frames, and injuries.
Other than that, it sounds lethal. Expansion should be a real issue. If it doesn't expand well, lawyers may be too. A medium bore 200 grain bullet sounds like it will over penetrate if it doesn't open up.
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