A handful of years ago a customer called me from the range.
A quick drive and there's a three month old G21 that had gone kaboom.
Hand load, yes.
But case head failure on once fired brass. Six more cases of the 50 were as thin or thinner upon inspection. Bad case not loading issue.
A call to Glock CS and off it went.
A week and a half later, a complete new lower under his upper, everything was still in spec with it.
Total of $65 for the frame and whatever shipping was.
And before that happened, a local Sheriff brought his early G2 19 in for sights (and cleaning).
As I wiped it down and inspected it, I pulled out a spare gun for him, informing him I was keeping his for a bit.
The gun still ran but had age cracks around the locking block and front rails.
@18 years old but barely broken in, he'd take a shot or two a week at coyotes but never shot it and it looked new inside.
A quick call and letter, the gun was on his desk a week later, no charge except the original shipping.
My aging G23, an early 90's gun, I keep a sharp eye on.
When it starts to crack, I will check with Glock, they may or may not warranty the gun as its been stippled, but when Gen 3 frames are $150-200 from outside sources, I'm not overly concerned.
As to your testing, good luck.
As an aside, years ago I made a case gauge. Sized to differentiate between the thin and thicker headed cases (internally) it allowed me to sort my brass into that I would keep and that I'd sell at gun shows.
Something like to consider in your experiment, case head thickness.