Wolf’s 115 grain FMJ bullets are just like this ammo’s cases, for that matter, because they have bimetal jackets. The bullet’s copper-washed exterior conceals its primarily steel jacket. That steel is too soft to cause significantly faster wear to the barrel, and it keeps the bullet from deforming during ignition or penetration of soft tissue. Most importantly, it makes the bullet magnetic.
But so much steel does make Wolf’s ammo super friendly to the old checking account, which is why it has so many fans. Even this ammo’s Berdan primers are a little more economical than the Boxer alternative, though they are just as non-corrosive!