OzFclass

Here is an old/classic BRL Arberdeern (Nov 1970) report on bullet engraving for those interested.

Please note this a DTIC link for those paranoid about the US government.

THE INFLUENCE OF HELICAL SERRATIONS AND BULLET ENGRAVING ON THE AERODYNAMIC AND STABILITY PROPERTIES OF A BODY OF REVOLUTION WITH SPIN

And a modern (2008) report from the US Army Research Laboratory, Aberdeen

EFFECT OF RIFLING GROOVES ON THE PERFORMANCE OF SMALL-CALIBER AMMUNITION