The Rugers have a byrillium copper firing pin and can be dry fired without any ill effects. The alloy does not work harden, is not prone to corrosion, and is not brittle enough to break under normal usage.
Been doing it for over 4 years on my SRH now, no ill effects. At the range I like to occasionally only load 4 rounds in the cylinder and then close it without watching to see where the empty chambers are. It will very quickly let you know if you've built up any bad habits since there will be no recoil to mask your movements. Used to do this with a dummy round in a 1911A1 magazine when I was a pistol instructor, kids that "knew" they were not jerking but couldn't hit the paper would almost launch themselves over the bench anticipating a recoil that never happened. Only had to do it once or twice and they figured it out.
I have always used spent cartridges regardless of manufacturers advertisements. The idea of using a deprimed spent cartridge with the primer pocket filled with silicone gasket sealer or something similar is just as good.
Dry firing gives you the opportunity to practice trigger control, sight alignment, grip hold and breath control. It is good practice technique. Just make certain your handgun is not loaded with live cartridges and that your firing pin, regardless of how advertised, is protected.
If you want to practice with your handgun in a way that it approximates loaded field weight, load your favorite bullet into a spent, deprimed cartridge and use those for practice. This has always worked for me.
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