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I would not trust head spacing on such a slight shoulder. Slugging the bore will give you the bore AND the land dimension.

10.2mm = .4015". That is not the bore or land dimension of any 10.75 cartridge.

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jgrabow,
You are tripping over language usage and proof house protocol.
Nearly everywhere EXCEPT amongst USA gun nuts, “Bore” is understood to mean “land to land” measurement ie: the bore of the barrel before rifling.
10.2mm would be the largest nominal diameter (not necessarily exact land-land diameter) of the proof house plug gauge that would slide into the barrel. The Brits did the same thing except in decimal inches.
- Mike

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