I use snap caps/dummy rounds at my work bench to function test pistols that I have either just worked on or have done maintenance to. Homemade dummies are hard to properly make and to make them instantly recognizable from live ammo.
For safety training, function testing or dry firing, A-Zoom training rounds are much more than conventional snap-caps. They are precision CNC machined from solid aluminum to precise cartridge dimensions, then hard anodized for ultra-smooth functioning and long life.
In addition, each round has A-Zoom's remarkably durable "Dead Cap" proven to withstand over three thousand dry fires while protecting the firing pin. A-Zoom Snap Caps last over 30 times longer than conventional plastic examples. Comes 5 rounds per package.
Buy a package or two for each caliber you shoot!