If you're too cheap to buy some snap caps, pop the primers and fill the pocket generously with silicone gasket material. Better than nothing, and you can use the rest of the tube for something around the house
....
IMHO, most 1911's are designed so that the hammer hits the slide anyway, which means no hazard to the slide, and the firing pin ought to be able to handle thousands of "overtravel" situations....
The P3AT shouldn't be dry fired - all kinds of terrible things can happen, we're told, and my XD9SC has a pin through the firing pin to prevent overtravel that is supposed to be vulnerable. IAC, most rimfires will likely take some damage, too, but I wouldn't be concerned about the revolvers - the hammer should hit the frame before the tip hits the cylinder.... (IMHO - maybe somebody could buy me a good rimfire revolver?
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Regards,