I discovered that I have two LEE undersized carbide sizing dies for 9MM. One is marked “A4” and the other marked “H4”. Both have the “U” stamp near the head and look identical to me. I checked the LEE website for info on the A vs H code (assuming that’s a code) and did not fine anything. Anyone here have any info as to what , if any , difference there is between the two? Thanks.
