I have one, and use it for my .340 Weatherby. If you have any belted brass that your dies won't resize the brass near the belt and you can't get it to chamber, you need this die. It is a little costly, but the with the amount of brass you can now resize and use, it pays for itself in a short time. I had several hundred brass that I fired in my original factory .340 barrel, but none would fit in my new Lilja barrel chamber. This die saved my butt tons of money by being able to recycle the brass. New Weatherby brass costs almost as much as a loaded box of some ammo, so it was a no-brainer for me. Order it now, and three months will be here before you know it. Also, Larry recommends using Imperial die wax with his collet die. I agree, and recommend you buy at least one or two of those and have them available when you get your LW Dies.