The recommendation to crimp well is true. I remember I used to keep one or two rounds of the CCI aluminum cased .44 shot as the last loads in the chambers of my 629 while out hog hunting. If I ran across a snake that needed dispatching I'd advance the cylinder so the hammer would fall on a shot load. One day I fired a couple of my full bore hunting loads. When I got back to the house and unloaded the revolver it was obvious that the shot loads had grown considerably. After that the shot loads stayed in belt cartridges loops until needed.