CZ 527 6.5 Grendel Feed Problems

[A5BLASTER]

A friend just purchased a CZ 527.
The bolt is really sticky, does not want to cycle.
He tried running the bolt (empty) hundreds of times to try to work it in and get it to cycle, even put some lapping compound on the bolt.
No joy.
If you push the bolt in directly from the rear using thumb or finger it will easily chamber a round.
Using the bolt handle, not so much.
Anyone know a fix?

Run it fast and hard.