Yet another endorsement of these snapcaps. With pictures (15 pictures, not the smallest, so bandwidth warning):
https://imgur.com/a/feVwE2vI tried to break one, I really did. I was unable to.
The first 3 pictures there show the effects of a single dryfire - basically zero impact on the snapcap except for a visible dent from the firing pin.
The next three pictures show the effects of ten consecutive dryfires on exactly the same spot. The effect is basically the same as a single dryfire.
The next four pictures show me finally getting something that looked visibly damaged, by dryfiring the same spot 25 times in a row. But of course "damaged" doesn't really mean anything, because it still works fine and extracts.
I then dryfired 25
more immediately adjacent, so you can really see it starting to smear out. It still feeds and extracts perfectly fine. I think after 50 dryfires on the same spot it no longer is being impacted much , because I couldn''t get it to break out any farther. I suspect if you used an older rifle that was less safe with snapcap-less dryfiring (so that you had to worry about the chamber), it might eventually wear out. With a newer rifle, I'm almost convinced you can't break these.
I was able to get a failure to feed up through the magazine once, but.... that's the exact same behavior I get with real ammo, because Savage Mk ii magazines are not very good. So, behaves like the real thing.
Anyways, A+ awesome snapcaps. Now I will be able to properly do ball and dummy at the range. Well, not now, because everything is still closed, but once the virus relents a bit...... soon ? Maybe? I hope.