I researched this on the internet and got mixed answers. I have a Ruger SP101 H&R 32 magnum, 4" barrel. I am trying to find out if I can shoot 327 magnums in it. Here is what I know: The two cartridges are exactly the same dimensionally except the 327 is ~0.18" longer or so. The sp101 cylinder has enough head space to load a 327 round. It would seem that the only safety consideration would be the increased pressures of the 327 round. This is where the ambiguity comes in. I have read that Ruger made all their sp101 frames to the same dimensions, heat treat, material, etc, regardless of the round. This would makes sense to me from a manufacturing standpoint - less variables and chances to screw up... Others say it isn't so. Guess I could ask Ruger, but I think they might be hesitant to admit it due to potential liability issues. Anyone one here have any real experience with this? Thanks.