Hi all new to the form and to Glocks, I bought a 1st Gen Model 22 about 8 Months ago, I did a lot of learning, The 1st Gen 40 S&W being a high pressure round with the Polygonal barrel and unsupported barrel, make it some what unique , My experience has been to buy the Redding G-RX Die, to return cases to a reloadable size, My Lyman dies would not size any of the brass from my 40 without shaving the unsupported side, I do not shoot cast in my gun, From the reading I have done, it seems the Glock ka-booms comes from a combination of Glocked brass, swelled at the base, weakening of the brass, and an increase in the already high pressure round, by modest leading, many shoot cast in Glocks with no problem, however I am a firm believer in Murphy’s Law. I cast for everything I shoot except the Glock, I feel the Berry plated bullets are cheaper than a new gun if the above is true.