Headspace...

[Bruce_in_Oz]

"The extractor claw is disengaged from the rim when the bolt closes."

Good point. You can see the extractor start to pivot outwards as the bolt-handle is locked down. But, as near as I can make out, it never deflects far enough to be completely clear of the outer diameter of the rim. Again, this ties in with the whole beauty of the helical locking system on these rifles.

As the bolt handle is raised, because the bolt-head thread is a coarse right-hand thread, the bolt head only moves back a little, initially, until the "little" lug on the bolt body picks up the 1: 1inch unlocking cam surface and starts the primary extraction process properly.

Clever things, these old rifles.