Sounds like their seated out too far and that their being held up on the lands when extracting. How does it feel when you close the bolt?
You shouldn't be having neck tension issues with new brass so I suggest you take a close look at how your seating die is set up. This should both seat the bullet to the right depth and crimp the mouth of the case to the bullet.
Take an empty case and resize it the run it through the seating die with no bullet. Does it do anything to the mouth of the case?
Yes I should have taken the Blue Pill!
We were so busy congratulating ourself of dodging Orwells vision we marched right into Huxley's.
Crimp case mouth on bullet, also sounds like you are seating into the lands.
Photo 1 shows what appears to be the slightest witness marks from your rifling.
(The Unspeakable In Pursuit Of The Uneatable.) " If I can help, I will help!." Former S.A.C.S. member!
If kneck tension has been ruled out, almost certainly not seating the bullet deep enough.
Thanks, I was keen to see the bare bullet v the loaded round. Something like this?