You may have a collet issue. You gotta have the collet that will work for the bullet diameter you intend to pull. (one that works with a .17 probably won't with a .50) Just screw it in the press with the correct collet inserted and they will pull anything including GI lacquered and crimped ball. They do beat up the bullets a bit, so I prefer the RCBS one (inertial, looks like a hammer) for "regular ammo", (like the 20 270s I had to tear down because CCI pistol and rifle primers come in the same color box and the lettering is so small.... well you get the picture.)
You can reach Wilson at 404 Pioneer Ave. - PO Box 324 - Cashmere, WA 98815
Phone: 509-782-1328 - Fax: 509-782-7200 but I don't even see the puller in their current website http://www.lewilson.com/products.html