I am going to make an educated guess on the 'problem'.
First of all I am interpreting the problem to be a bolt that is hard to close and open on some factory cartridges. Apparently this disappears after the cartridge is fired.
If that is the case you may have a chamber that is ever so slightly tight on a go gauge or ammunition that is ever so slightly long on specs, or a combination of both...
Probably nothing to do with the extractor at all. It is not uncommon for ammunition to be slightly out of spec and I suspect that is the case with the chamber simply being made with minimum headspace.
If the headspace is incorrect a chamber reamer is going to be required to fix that. If this is a new rifle Remington should be involved.
I have never seen a factory chamber with 'burrs' on the shoulder and don't know how that could ever happen.
First of all I am interpreting the problem to be a bolt that is hard to close and open on some factory cartridges. Apparently this disappears after the cartridge is fired.
If that is the case you may have a chamber that is ever so slightly tight on a go gauge or ammunition that is ever so slightly long on specs, or a combination of both...
Probably nothing to do with the extractor at all. It is not uncommon for ammunition to be slightly out of spec and I suspect that is the case with the chamber simply being made with minimum headspace.
If the headspace is incorrect a chamber reamer is going to be required to fix that. If this is a new rifle Remington should be involved.
I have never seen a factory chamber with 'burrs' on the shoulder and don't know how that could ever happen.