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On another forum I have been asked not to type slower, or was I told not to say I can not type any slower, in any case, if I could type slower I would. I determine the length of the chamber first, I do not find it necessary to fire a case to determine the length of the chamber. I know it must be boring for the members of the ‘CENTURY CLUB –50’ AKA ‘HALF CENTURY CLUB’ to hear about my M1917 Eddystone with .016 thousandths head space, meaning the chamber is .016 thousandths longer from the face of the bolt to the shoulder of the chamber than the (minimum length case .000”) case from the head of the case to its shoulder. The first time I fired that rifle I fired it with .002 thousandths head space. Then there is ‘how to determine the length of the chamber, me? I determine the length of the chamber 2 different ways without a head space gage, remember, there is no such thing as a + .016 thousandths head space gage over minimum length.
Back to bump, in the real world when someone says “I bump my shoulders back etc., etc..” I ask, “How do you do that?” anyhow, I can’t, by the time the shoulder of the sizer die gets to the shoulder of the case the case body is in the grips of the sizer die body, once the shoulder of the case contacts the shoulder of the sizer die the case has few options, the case can compress, shorten, or lengthen and or both, and of course I control sizing by adjusting the die to and or off the shell holder with a gap determined with the use of a feeler gage, back to determining the length of the chamber first, knowing the length of the chamber allows me to adjust the sizer die for sizing.
F. Guffey
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