Old Fuff, thanks for that great information.
Because I have read so many bad things about the poor quality of guns made by Palmetto, I do not want one. So it looks like my only options are to use an Uberti made gun with 4" barrel and have the barrel relined. Or don't use a conversion cylinder, in which case I would choose a model1862 Pocket Police because of the longer barrel. I see Cimarron now sells one with a 6 ½" barrel.
I used to shoot larger size revolvers, but because of serious health problems now I have to use very lightweight and very low recoil pistols. I love to shoot those old Colt pocket pistols because they fit me like a glove. It is by far the easiest revolver for me to cock and aim one handed. And the balance is perfection. Because of my aging eyes the front sight is real blurry on pistols with short barrels, and that's why I want to use one with a longer barrel for hunting.