Hey while I have the reamer anyway I would like to be able to shoot 10mm from my rhino chambered in .40 it's made on the original .357 frame so I don't think the pressure would be an issue
It may be possible, however...attention needs to be given if you still want to shoot the 40S&W therefore machining to allow for a moon clip arrangement would allow for the use of both cartridges. If you just ream the cylinders you limit it to just 10mm.
Not trying to deter your choice, just info of thoughts. 8)
It already takes moon clips so it can fire both when altered
I am interested in this conversion as well. Would like to hear how it turns out.