I just started reloading and have fired 750 rounds of Zero 230g FMJ with no issues. I bought them on recommendation of a competitive shooter on another forum who claims that a lot of IDPA guys like them. I'm loading mine with 5.3g of W231, CCI 300 primers, mixed brass and a 1.270 OAL.
They shoot at least as accurately as WWB or Blazer Brass 230g factory ammo, and work well with the round-nose seating die that came with my Dillon SDB.
Zeros seem to leave a little more copper fouling in my poly bore than I've seen with other ammo, but I can't tell for sure. I have some Precision Delta 230g FMJ on order, and will compare them with the Zeros in the coming weeks. They cost about the same as the Zeros I bought from Powder Valley.