Below are sections of the chamber drawings of the various 6.8 x 43 mm chambers showing the area discussed in the article.
Original SAAMI Chamber showing the angle error. On the drawing above, based on the dimensions specified in the drawing the angle works out to 70° 55':.
Original second version SAAMI
Chamber ("SPC II") showing more generous specs
* I have recently been informed that the SPC II reamers currently (2/09) being cut now actually have a 45 deg angle, which would mean that the horizontal measurements would be .105 and .0905", giving .01495"
DMR (Designated Marksman
Rifle) chamber showing
improved angle. If you do the
Thanks to Tim W. for supplying the drawings
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