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how in the world does one measure spin rate decay on a projectile. Guess I'll have to buy the book to find out.Modern Advancements in Long Range Shooting is a book series by Bryan Litz which documents the ongoing R&D taking place in the Applied Ballistics laboratory.
Many topics are covered in this first Volume, including the effects of twist rate on muzzle velocity, BC (supersonic and transonic), precision, even spin rate decay for various rifling profiles is tested experimentally. Other sections detail the evolution of modern rifle, bullet, and optic design.