They don't expand like a Barnes. The Barnes will expand down to 1200fps.

The Federal bullets were tested on Jon'r forum. I'm a little fuzzy on the details, but at normal 100-150yds they expanded fine. At 250yds they didn't expand at all. I believe the load was 110gr of BH 209.

However, this was the first run of the bullets. Something might have changed in the construction since then. They did have a delay in production, so who knows if they changed something?