I'm sure there are many here that, like me, know absolutely nothing about reloading. I'm aware that only brass should be used to reload ammunition, and not steel cases. My question is why? While we're on the topic of steel cases, why do some gun manufacturers only recommend using brass factory loads, and not using brass reloads, or any steel case ammo? If I can recall correctly, I believe my Glock manual strongly discourages the use of steel case. Is there any truth to this? And again, why?