I have used Glocked 40 S&W brass for light reloads in my S&W 646, STI Trojan, CZ-40B and PO16-40. I use either WST or American Select with 155 to 180 gr. plated or jacketed bullets for about 725 to 750 fps - my semi autos required lighter recoil springs to function reliably. At one time I did use cast elad bullets in those same guns at the same velocities. I reload the 40S&W brass 4 times before tossing it into the scrap heap. I use a normal Lee carbide die set and Dillon 550 for my 40 S&W reloading.