So, you have a 9mm handgun for self defense at home, but can't find ammo during this time. Don't despair, just get out that Ruger 10/22 or Marlin 60, and have it ready.
Personally, I don't think you would lose much, by doing so. An old model 60 with 16 Mini Mags can be quite formidable..as can a Ruger 10/22 with a couple mags.
A pump or auto shotgun with low brass #6 shells, can do very well also.
Just my $ .02 ..