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You will not be able to drive a 180gr bullet to 2000 fps in a .357 mag case.
The pistol primer will not take that kind of chamber pressure, and neither will the case. Common revolver brass designed for handgun pressures, starts to plasticize (flow) at around 52,000psi. You can't drive this kind of brass up to the pressures that your #1 can handle. Go to a rifle cartridge if you need that kind of power. The other problem is case capacity....you can't get enough of the slow burning type of powder that you would need, into the case to reach those velocities.
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