CZ. Apparantly even back in the Brno 602 days, half those in 458 had feeding issues. Depends on who's cycling the bolt too. The previous owner of my CZ had issues with many different projectiles, but they worked for me (go figure). He had the feed ramp modified, but wasn't successful. The rifle was going to be parted out but I ended up buying it (reduced price).

I normally use the 400gn Woodleigh PP and they feed 99% of the time.

I'm led to believe that CZ-USA convert them to 458Lott to fix the feeding issue (our CZs come in from CZ USA) - the longer case changes the feed angle (the jamming occurs when the projectile gets caught up in the extractor recess inside the action, and this only happen with rounds coming out of the LHS of the magazine).

I thought all CZs coming in now were now 458Lott, but maybe they only convert those that have issues. I notice Rebel's are selling both 458 and 458Lott in new CZs.