The roll crimpers sold by Ballistic Products are basically the same as what Lyman used to sell (maybe still does).

Here's the demo from the Ballistic Prodcuts website: http://www.ballisticproducts.com/bpi/articleindex/articles/rollcrimp/rollcrimp.mpg

It does a good job. Here's a photo of some 10ga. 2 7/8" shotshells I loaded several years ago using a BP roll crimper. These are plastic shells that I cut to length. I used my drill press rather than a hand drill.

For 12ga. I have an old hand roll crimper that does just fine.

Roll crimping is not difficult at all.

Curl