Lee Full Length Sizer Dies are built to last a lifetime and are great at producing factory like ammunition. Lee Precision has been manufacturing high quality, affordable reloading equipment since 1958. The Lee Sizing die is no exception. These steel sizing dies require the use of a quality resizing lubricant. Shellholders sold separately. Notes:7.62x39mm, product 316-656, ships with the 0.310" Easy X expanderThe 280 Ackley Improved die is for the original wildcat version. The SAAMI spec 280 Ackley Improved chamber is . 014 inches shorter at the datum line headspace dimension than the traditionally accepted wildcat chamber spec as previously produced.