if you wish to dismiss 3 pages of emperical data in guns and ammo by ross seyfried, that's up to you- he started off with a 22 inch barrel blank, and a 44 ruger blackhawk- he then fired a round , measured the velocity,and shortened the barrel by 1 inch until he got to 2 -3 inches , recrowning and re-seating every time- from the chart you could see the "ideal " point was about 7.5 to 9 inches with the 44 mag and by the time he got to 5 it was down to 950 fps- that's only about 100 fps better than the 45 acp-