One of my references has been AMP connector site...
http://www.te.com/catalog/menu/en/19231
You can search around on the site and find a lot of catalog pages that contain significant info including the correct method to use, the correct tooling for their products and the contact resistance for their connectors. Warning, the site contains a lot of info so you may get caught there for a long while. In one of the catalog pages I found a contact resistance rating for 1/4" blade contacts speced at <2mohms.