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6BR Norma Base to Datum Measure

Check this post for reamer prints. Should have the info you are looking for. But not all datum line measurements will be the same.


 
If you're asking about 6RemBR then it's 350 for datum and best calculation is 1.1555-1.1565"? My datum chart shows 350, but calculated at 365. Datums are the same as 22br, 22-250rem, 6ppc and 6dash. If datum is 350, then it adds .0815" to 1.075". Geometry isn't my thing!