I do not think I would take a SSM and ream it to 327. I know the single 7 is available in 327 but the SSM , 32 mag, has a max pressure of about 22K PSI and the 327 runs in the 40 K range. While the SSM may take 327 pressures , that is not what they were proofed for. Just for grins . The cylinder on the SSM was made from the same steel that the blue red hawks were made from so they are strong but not rated for 40K pressure when they were built !