I went through several thousand of Zero's 158-grain RNLs at +P velocities when I started shooting IDPA in the late 90s. My 67-1 loved them. Even at the higher pressures/velocities, they never leaded. I once went through >700 rounds in a two-day class with no leading, though the cylinder was black by the end of the class. I also went through a box of 500 solid-base wadcutters over 2.8 grains of Bullseye, also with no leading.
The lube they use is soft and sticky, which is probably part of the reason they worked so well. It's definitely the reason I stopped using them. I switched to plated bullets, which aren't as accurate but are much nicer to load.