Squib!??!?! I thought we were talking about over charge or detonation..
There is no such thing as detonation. Period. There are cases where you can get flash over but smokeless powders cannot detonate, they burn. From reading articles written by folks I trust, there has never been a laboratory that could replicate a detonation using smokeless powder...never.
The Gen 3 and Gen 4 Glock's chambers support cases as well as any pistol chamber does. The early ones didn't and the Gen 1 Glocks were the worst. No argument there and most of the Glock failures were in the 40cal. guns. I am not sure why so many Glock owners still are in denial.
Lee can write what they want in keeping with whatever legal advice they get to avoid any potential lawsuits from users of their equipment.
None of the above would prevent me from owning a Glock IF I had a need for one. I don't, so I don't. For what I use a pistol for there are a host of better options than the Glock. I would also not hesitate to reload for a Gen 3 or 4 Glock. Folks do all the time without incident other than the normal opps one would expect when you have amateurs playing with gun powder.
The Glock pictured above would be an early Glock with an unsupported chamber and those did let go more often than Glock would ever admit. The Portland Police Dept. went from 40cal to 9MM several years ago because of multiple Glock failures using factory ammo. You can google it and do a search. I point that out because it is not just "bad reloads" involved with the Glock Kabooms. If you don't own a Glock Gen 1 no worries, if you do, understand the issues and do what you want. If it were me I would simply buy a newer version barrel and have it fitted if necessary and carry on.
Take Care
Bob