I have an Italian Breda 24 hammergun that I got late last fall and shot a couple of roosters with the #5 shot shells that Grafs had on special. I agree that the crimping is a problem. Tried some roll crimping but does not work right. Was going to try to modify a roller from ballistic products. I do use the magtech brass hulls for my 28 ga mostly black powderwith duco cement to seal the overshot card. I am going to try the duco cement on some of the plastic hulls to see if that will work with nitro. I would be interested in a roll crimper tool.
Dwight