I reload the .40 S&W for my Glock 23. I also use the Redding GRx resizing die. This is because I had to, it simply didn't work without removing the "Glock Bulge". I tried the LEE die first, actually it was the LEE factory crimp die with the guts removed. It worked, but after a few problems I found that the Redding GRx worked better (for me). If the LEE bulge buster in .40 isn't made to remove Glock Bulge, I'd also question what was the intended use?
I have .40 brass that has been resized and reloaded three or four times, and never had a problem. I do stick between low and mid range reload data.
I load, 9mm Luger, 38 and 40 S&W, 38 Special, 357, 45ACP, 45 Colt, 223, 243 and 30-06