I had a similar issue. Much smaller cartridge though. Check the primary extraction.

In case you don't know. The ring that stays stationary when you lift the bolt on the back of the bolt with the ramp on the back side engages a ramp on the bolt handle. It should push the bolt back just a little when the bolt is lifted all the way up.

I had a case of the stupids and didn't notice the alen bolt on the back of the bolt had come loose and backed out a little eliminating primary extraction.