I have empty hulls in 10, 12 and 16 roll crimped and use them when changing gauges. I raise or lower the table and bring the crimper down on to the hull mouth and set my stop. Then they ae uniform. When changing from 2.5 to 2.75 I just adjust the table height. I pour the powder and seat my first hard nitro card and check for uniform height, insert my lubed fiber filler and a over powder card or another nitro card depending on hull length and again check for uniformity. If they are not all the about the same I use a bit more hand pressure to compress the column a bit more. Pour in the shot and again check. If necessary I add or subtract a little shot to gain uniformity. It only takes a few pellets. Once everything is the same I apply the roll crimp. They look great and perform better. Both smokeless and Black powder. Cheddite hulls work great for this and with I mostly use roll crimped shells for black powder for 1 shot and toss. Do not like fooling around with reforming the hull mouths and with 3 dram loads the hulls start to get pretty fried. More money than brains I guess. Federal papers also can be roll crimped but they do not look as nice, even when trimmed to 2.5 inches.
