I believe the 38 Super is a semi-rimmed cartridge so the rim diameter is greater than the 9 mm Parabellum and the breech face would have to be milled out a bit. One might think of 9 mm Magnum brass trimmed to 38 super length.
My own idea is that AIMCO should be encouraged to produce a Luger chambered in 357 SIG. They once made a tool room job in 10 mm, so there is a bit of background experience. In this case the whole pistol would be scaled up a bit to handle the hotter round.
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