Thanks Chuck:

Update:

I replaced the follower in my CZ with a modified one made from a Swede 96 follower. It had a noticeably positive effect on feeding because it has a central rib that extends farther forward than does the rib on the CZ follower.

Unfortunately it is too narrow and can twist in the mag box and jam, so I removed it.

Regardless, I am seeing pretty clearly now why the CZ550 cannot be trully said to be a "CRF" action when chambered in the smaller calibers.

I wonder tho, about the "longer, smaller" calibers. For example, my gun is 6.5x55. I wonder if the .30-06 and 9.3x62 or .270's are better at controlling feed, as they might leave the box at a slightly different time, preventing the jump of the cartridge that occaisionally allows it to pop in front of the extractor.

All-in-all, tho, I am not 100% impressed with the CZ action, at least as it involves my rifle and some others noted. From what is reported here, with the bigger calibers on the H&H or .416 or .505 cases it appears to be much more reliable.