Glad that came up! The .327 Mag is a very interesting cartridge and it increases the capacity of the SP101. There are more similarities with the .357 Mag than some may be aware of. The sectional density of the .357" 125 gr. XTP is .140 while the sectional density of the .312" 100 gr. XTP is .147 and slightly higher. And sectional density plays a very large roll in penetration.
Looking at handload data shows that the .327 Mag is no weakling. From a 5" barrel using a MAX Charge of AA No 9, the Western Handload manual shows velocity at 1574 FPS at 8000 PSI below the cartridges Max Average Pressure, or MAP of 45,000 PSI. And there's another bonus there. Older Magnums had their MAPs determined by the Copper Crusher method, or CUP. Rating this cartridge in the PSI system should help give a better understanding of the pressure levels.
Unfortunately, I've only had 1 chance to fire the Ruger LCR with factory loads at a slightly more sedate velocity. Still potent, and recoil seemed quite controllable. I have not run any loads through the QAS computer program as yet, but I know it will impress. If anyone wants to see those results from water testing, just shoot me a PM or post in the Reloading section. The test parameters are easy enough to collect while I still use the 1 - gallon water jugs, formerly milk jugs. Velocity upon impact, or chronographing at the same distance as the 1st jug is placed, recovered mass and average recovered dia. are all that's needed. As far as average dia., that's the 3 greatest dia. measurements on the expanded petals and the 3 inner dias., between the petals.
For anyone who's not quite comfortable with .357 Mag. recoil from small revolvers, and Ruger shows the weight of the LCR at 17 oz., the .327 Mag appears to be an excellent alternative. Handloading should make it a blast!