I usually agree with C.R.Sam, not this time however.
To me unfluted says: I contain a stout, hard hitting caliber, and I need the extra strength.
Yes, I know about the dimension between chamberholes being smaller than the extra metal on the outside. But somehow it just makes me feel better having the extra meat.
In my family, all happily belivers in the 2nd ammendment, the young or those frail of wrist don't shoot pistols with unfluted cylinders.