From what I have read and seen the .32 Long can be loaded much hotter than manuals say before showing any signs of overpressure.

Hodgdon's posted max for 90gr is 2.7gr of Universal (844fps from a 5.3" barrel), but I got up to 3.3gr with a 100gr bullet with absolutely no signs of overpressure. Some of my old manuals got up to 4.3gr of Unique!

Like .38 Special, .32 Long has been neutered to be a shadow of its former self. I don't think reaming to H&R is necessary - just load up some hot .32 Long!