Another key point:
If you use mixed range pickup brass for 40S&W max powder charge loads, how do you know what condition of the brass is you are using?
Even though a case that's been loaded overmax more than once can be push-through resized using an undersized die like Lee FCD. After a nice polish job in the tumbler, you wouldn't be able to tell you have a weakened case that's been work hardened and ready to rupture if given an opportunity.
It is for this reason I keep a separate box for "known" once-fired 40S&W brass for near max/full power loads using PowerPistol/Universal/WSF/AutoComp. For mixed range brass with unknown history, I use lower pressure target loads (start-to-mid range load data) using W231/HP-38.
Am I OCD? Probably, but I have not experienced any KB in my 40S&W Glocks (Gen 2 G22, Gen3 G22 and Gen3 G27) the past 17 years.
If you shoot a lot of reloads in 40S&W, I highly recommend the use of aftermarket barrel with tighter and fully supported chamber. The tight chambers of Lone Wolf barrels do not allow bulging of the cases and minimizes work hardening of brass. I consider them my ~$100 KB insurance.
Also, resizing the spent cases takes much less effort and based on my experience (over 200,000 40S&W reloads), tighter chambers seem to extend case life.
Be safe, but do enjoy your Glocks!