Joe, it sounds to me like you hit on the exact feature on the Extrema about which I was asking. So what you're saying is I can depress the shell detent and it will dump the magazine cleanly without cycling into the chamber. Cool. That's got to be a feature of any auto I'd use here because like many other states, both the chamber and the magazine have got to be empty every time the gun is in the truck. Most shops are a little shy about test loading their demo guns.
I've been wearing out a Beretta 686 Onyx with a 3.5" chamber. It's about 10 years old and it's been around the world. One mean coyote bit the butt stock a couple of weeks ago and now it's sporting some gnarly tooth marks.