Thanks everyone for your very nice comments.
Kevin: I cut a rectangular notch in the barrel about .032" deep, just a little smaller than the minor dimension of the sight's dovetail. I sharpened a cold chisel that is wider than the barrel flat...It likely has a sharper angle than when new, but it comes to a sharp edge. Rice, Getz, Colerain and the like barrels form easily...Green Mt. and Rayl, not so much. I lay the flat of the cold chisel in the notch, and use a 3 pound sledge to whack the chisel, tipping it slightly so that the metal on the outside of the dovetail moves first. Then I rotate it so that the other corner gets lifted, just a tiny bit. The third strike is with the chisel at ninety degrees to the bore. The chisel must lay flat in the bottom of the dovetail inlet so that the force is lengthwise, not DOWN. Otherwise, you risk denting your bore...very bad! Then I do the other side of the dovetail. When I have a significant amount of steel lifted, I use a safe-sided three sided file to clean up the bottom where the chisel has 'bruised' the dovetail, and bring the dovetail itself to finished shape. The rear sight should just start at this stage, and taps with a light hammer and a drift will not drive the sight in. I drive it back out, and continue to file until the sight goes in snuggly but not too tight.
Now I dress down the top of the raised steel creating a little flat, and shape the raised steel to yield clean angles...the raised steel is a lump before the filing. Also, the angle flats get dressed down, because the raised steel protrudes out the angled flats as well, and that is un-necessay metal.
One advantage of this type of dovetail, is when the sight is too loose, within reason, one can use a flat punch to tap the dovetail tighter. Raising the metal more than doubles the amount of steel closing on the dovetail of the sight, giving a very positive solid dovetail.
Here's another couple of examples: an original Kuntz and my copy of it. Notice the lovely ground for witness marks once the rifle is sighted in.