My one of a kind Taurus M607-8SS. The M607 was a seven-round predecessor to the eight-round M608. It was only produced for two years was not available with the 8 3/8" barrel. My revolver is actually the M607 assembled crane/cylinder & action installed in an M608 frame. The reason for the build is the cartridge that it uses; the .360 Dan Wesson. Both the M607 and M608 cylinders are long enough to handle the .360 DW, which is 1/8" longer than the Magnum, but the seven round cylinder has more metal around the chambers to better handle the higher pressures the .360 DW operates at.
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