Tried it with various bottleneck cases...no discernible difference. However, using a 45 Colt case with a reduced load, the mv was regularised over a dozen rounds. The 45 Colt was a blackpowder pistol round taking ? 40gns of black powder and loading it with 8gns of Unique, does leave a lot of space. Only need a small piece of dacron filler, pushed down with a pencil to keep the powder in the same place. No noticeable flame etc from a 30" barrel!
amc577