Also, as Glocks in all calibers are so popular I have to pay special attention to any once-fired cases I purchase, as some of them may have been fired in a Glock. The unsupported chamber in a Glock causes a bulge just ahead of the rim. This bulge can't be removed with a standard sizing die as the case can't be push far enough up in to the die. Lee Precision makes something called a "Bulge Buster" to remove this bulge. Some hand loaders never have a problem with "Glocked" cases, and some do. If you have any failures to chamber, this may be the cause. Just thought I'd mention it.
As a side note, you can purchase an aftermarket barrel (around $110) for your Glock 22 which will allow you to shoot cast (or jacketed) bullets. These aftermarket barrels have fully supported chambers, and the saving in cast vs jacketed bullets would pay for the barrel in no time. I should also mention that while Glock forbids it, some shooters use cast bullets in their standard Glock barrel. This can lead to excessive lead build up and increase pressures significantly. Maybe some Glock reloaders can chime in on this point.
Lone Wolf Distributors - Product Detail - LWD Barrel M/22 40 S&W Stock Length - $109.95
Go to youtube and do a search on "Lee Bulge Buster" and "Glock barrels".