I just picked up a single six in 32 H&R Mag(yesterday) and was also thinking about reaming it out to 327. I haven't checked yet but assume the leangth of the cyl. will fit.
I have a 3914 tacl. a 3913 and the 3953. I put Wolfe spring in the 3953 and the trigger is about perfect. I like the 3914 better than the 3913. I
think I'll end up selling the 3913.