The copper plating on these types of bullets is very thin, and the bullets themselves are almost totally pure lead, so they are quite soft.

They'll do very little more wear than plain lead will. remember that these bullets have a ceiling of around 1200 fps for top velocity, so keep that in mind.

For plinking up where you are, they are fine, but I personally wouldn't want them in my gun for defense against any four legged creatures since they are so soft.