I'm not sure why you're getting them all dinged up ....but if there are any burrs on them / I'd probably polish them off... The metal in a snapcap is pretty soft ...but it might scratch the mag tube or the chamber on the barrel -- I suppose ...
If you're practicing over a hard floor / or concrete ....lay a big piece of cardboard or a big beach towel or something down so they aren't bouncing all over and getting dinged up ....
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