I've been unable to find the COL for the .327 Federal but in photos it appears to be as long, if not longer than the .38 special which is too long for the cylinder of a Ruger single six. As for H&R revolvers, remember that the chamber pressure of the .32 H&R was held down to 21,000 psi out of deference to the flimsy H&R revolvers. The .327 Federal is listed as a 45,000 psi round. You fellows are talking about some dangerous conversions which I doubt any gunsmith would undertake even if it were possible.