Just got a Stoeger 20-Gauge 20" barrel shotgun at a yard sale. I vaguely remember seeing stainless steel reloadable shotgun shells online a long time ago (1990s)? I reload 454 Casull shells and would like to reload metal shotgun shells if they actually exist. Does anyone remenber such existing, and if so do they still exist to buy or am I just getting foggy with age? Thanks to any help with this question.