Similar to when you are driving, walking, etc. Your head should be in a normal erect position. However, as previously mentioned, some of the best shooters in the world use different methods that they find works best for them.
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Morgan Craft competes in the women's skeet final at the ISSF World Championship Shotgun on Sept. 13, 2015 in Lonato, Italy.
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Vincent Hancock from the Army AMU and US Olympic team
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Kim Rhode 6 times Olympic medalist
None of these champions use a totally erect head method and they are very successful.