I load .40 to duplicate factory ballistics. I will not use brass fired in a Glock barrel. Buy a supply of Winchester white box or Remington UMC factoery ammo and reload your own brass. You won't have any problems. Better yet, buy a case of it.
There is no need whatsoever to load light target loads if your gun has a supported chamber and your brass has only beern fired in your gun.
If you think a mighty military force is expensive, wait 'til you see what a weak one costs.