Well I intend to check the dimension between the bolt face and locking lugs to make sure. I am not stupid about such things.

Hoping the threads on these heads are at least loosely timed and not completely untimed. Garandicon gas cylinder locks have untimed threads but this doesn't affect headspace.

I started into milsurps years ago on M1903s. Lord knows that rifle had a long list of problems, but by the 1940's it was a perfectly good bolt action rifle. They had worked things out.

This business of the bolt head...to me it just confirms the No. 4 rifle as yet another example of needlessly peculiar Britishicon engineering. Letting the quirks become the defining attributes when they should be eliminated.

Primers sometimes leak at the edge and leave an arc of etching in the bolt face. Some brass (commercial Winchester) is known for this.

Examine enough Russianicon milsurps and you will see plenty of these circular scars in the bolt face.