I believe the "re-inventer" of this crimp spells his name Hartin.

Not really important, but if you are going to be immortalized, it is nice to have your name spelled correctly.

Erik,

The Hartin Crimp uses an overshot wad and a fold crimp in combination. Shorten a 2 3/4" shell to 2 1/2" and a part of the original crimp remains.

Insert overshot wad and crimp as normal. Since you have shortened the hull the crimp would have a big hole in it that is now filled by the overshot wad.

One picture (anyone have one to post?) would explanin it alot better than I did.

Mike