I think it's great all of you have reloaded so long and successfully for the .40 S&W. I hope it stays great as you keep using that reloaded brass, pick up range brass with who knows how many reloads behind it, and keep shooting unsupported chambers. The .40 is a hot high pressure round. A little safety research is prudent in all reloading, but perhaps more so with this round.
I don't know, it just seems to me there's a lot of head-burying going on here...or at least some glossing-over on people's research and information.
Redding makes this die for a reason.
http://www.redding-reloading.com/pages/grxpushthru.html
I do own one of these guns and I have dies and components to reload it with. But I'm going to buy the Redding "Thru" Die, and get as much education about loading the .40 S&W as I can. Consider, for example, May/June 2004 Police and Security News reported in a feature entitled, "Why Guns Blow Up!":
One last cause of "blowups:" The simple chambering and rechambering of a cartridge does push the bullet back into its case. Hirtenberg Ammunition Company of Austria (at the request of GLOCK, Inc.) determined that, with a .40 caliber cartridge, pushing the bullet back into the case
1/10 of an inch doubled the chamber pressure. This is higher than a proof load. This "push back" can occur with but one chambering since it is dependent on how well the case was crimped or sealed to the bullet. How many of us regularly chamber and rechamber the first two rounds of our carry loads? (Also, this chambering and ejecting chews up the case rim, which can cause a malfunction. If you are limited to how much ammo you are issued, after cycling the first two rounds a few times, strip the magazine and load these two rounds first so they are the last up in the stick.)"
One web site has gone to an awful lot of trouble to warn people.
http://www.thegunzone.com/glock/glock-kb-faq.html
Lets just get the best information and use it to load safely. Summarizing, it appears that .40 S&W troubles happen when one combines weakened brass with unsupported chambers and/or with insufficient crimping allowing bullets to push into case and increase already high pressures.