Thread: Very hard extraction.

You could have a build of carbon around the neck area into the chamber. One way of clearing that is rotating a bronze brush in that area after having stacked the area with a carbon remover like Boretech c4 or some kroil oil.

Maybe your chamber needs cleaning or polishing as well?

But also start with less powder reloads and see what happens.
You could also have Primery extraction issues with too big a gap between the bolt handle and rear of the action cam face. It pays to put a bit of grease on that area as well.