I read Old No 7's post on recutting the forcing cones and chamber mouths on a pair of Ruger D.A. revolters. He stated that he used an 11 degree cutter on the cones. I was under the impression that the cones on Ruger D.A. handguns are factory cut at 5 degrees, read that in brownells catalog in the reamer section. Am I misinformed? I know the D.A. cones are indeed cut "gentler" than the cones on the S.A. guns.
In ransom rest tests that I have done, the D.A. wheelguns almost always shade the S.A. guns in group size, sometimes by a wide margin with both jacketed and cast bullets. I understand there are more issues at play here than just cone angle such as cylinder/barrel alignment, bore condition and so on but it stands to reason that the gentler the entry angle ,the less the bullet will be battered while trying to align itself on its trip down the tube.
Longpoint
In ransom rest tests that I have done, the D.A. wheelguns almost always shade the S.A. guns in group size, sometimes by a wide margin with both jacketed and cast bullets. I understand there are more issues at play here than just cone angle such as cylinder/barrel alignment, bore condition and so on but it stands to reason that the gentler the entry angle ,the less the bullet will be battered while trying to align itself on its trip down the tube.
Longpoint