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Yep the abolt may have a more generous chamber and the web may have grown out to that and the CA maybe tighter causing the problems.
Reload factory ammo fired in it, if you can get 4-5 full power...

When sized do they then chamber and extract fine or still sticky?

Another thing it could be is the base of the brass expanding and the die not being small enough to pull it in.
Can happen with...

The first bit of case extraction is performed by lifting the bolt hence primary extraction and uses a camming action to start the case rearwards.
Rem 700s are bad for this not being set up properly...