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The bolt could be sitting centred on the front bridge and relying on the bolt face resting centered on the cartridge case also if there is any loose dimension there, the extractor and ejector could...

Yep that is one of the ways of solving the issue.
I have seen another way which is having a mandrel of the exact outside profile and diameter of the bolt.
The mandrel is placed in the bolt raceway...

Hey RG,
I have question for you:
Once you have trued everything, how do you compensate for the slight angle on the vertical plan of the bolt in the raceway of your receiver when it is under tension...