If you're looking at the MEC they offer an adjustable bar for your shot and powder and it can be adjusted this is what I went with and it works well. Most crimps come out pretty good to fool most people but you have to watch as the odd one will go to **** on the first stage and you have to redo it. You can also adjust the final crimp to stop swirls and gaps.

My JR isn't a progreesive press you have to move the shell through each station individually but it my have changed. But definately look at the adjustable charge bar.

Crawdaddy