I want to add some comments regarding the 3" target 1899 that I presented earlier in this thread.
First, we made up four barrels, in different lengths: 2 1/2", 3", 3 1/2", and 4 1/2". I was experimenting with the overall appearance of shorter-than-4" barrels on a Model of 1899. I concluded that the 3" and the 3 1/2" were the best.
Second, I wanted them to be good shooters. Since I was starting from barrels that were already bored and rifled, and had never been fired, we assumed that the rifled bore was the truest part of the barrel, and we used that to anchor the barrel in the milling machine. In this manner, the machining to form the threaded end would be perfectly concentric with the bore, and the front sight base would align perfectly with the center-line of the bore.
Third, knowing that Jim Fisher is a GOOD shooter (and much better than me), I let Jim test-fire them. The next three pictures are the targets that Jim shot with the 3" gun. The Fishers and I had earlier presented the display "Guns of Famous Shooters" at the Spokane S&WCA Annual Meeting, in which Ed McGivern's record-setting gun, and target, were included. McGivern was always very cognizant of tight groups, and also of details about the shooting of each target. Jim incorporated those ideas on each of the targets that he shot.
As a comparison, this next picture is a target shot with the 3 1/2" revolver.
Regards, Mike Priwer