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Properly breaking in a rifle barrel is one more step in achieving the ultimate in rifle accuracy. Larry Potterfield, CEO and Founder of MidwayUSA, demonstrates one process for breaking in a new rifle barrel during this brief video.
Step-by-step mechanics reveal that Usain Bolt hits the ground with a peak force of over 1000 pounds with his right, but not his left leg in these steps from this high-speed race footage from NBC Universal Sports.
Ground forces were determined from Bolt’s gait mechanics using a new method described in this video: https://youtu.be/PfHNOwmmik4 and fully explained in this research article: https://jeb.biologists.org/content/early/2016/11/02/jeb.138057