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Rifles, Reloading, Optics, Equipment
Gunsmithing
Excessive Headspace!
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<blockquote data-quote="Rustystud" data-source="post: 339599" data-attributes="member: 9964"><p>Head Space is exactly that.</p><p> </p><p>1. On a bottle necked rimless case it is a measurement from the "Datum line to the face of the case head." </p><p> </p><p>2. On Belted Magnum cases it is the distance from the front of the belt to the face of the case head.</p><p> </p><p>3. On Rimmed cases it is the distance from the fron of the rim to the back of the rim or case head face.</p><p> </p><p>Simply understanding that there has to be a little space between the chamber and the cartridge or it want chamber. As stated pristine target rifles can have tighter chambers. Hunting rifles are generally built a little looser to prevent dirst, dust, unspent powder residue from keeping the bolt from closing.</p><p> </p><p>SAAMI "Small Arms and Ammunition Manufactures Institute" are the industry standard. There secs insure that all factory rifles will function with factory ammunition. The allowable varible in chamber and ammunition is .0035"</p><p> </p><p>As previously stated a little extra head space alone is not very dangerous. We all know the case will fire form to the chamber. The danger comes in to reloading case that are fired in a gun with excessive head space. Every time one reloads a fired case from a rifle with excessive head space, it is bumping back the shoulder if the case is going bacl to SAAMI Spec. Repeated shoulder bump allows the case to stretch and begin thinning in the web area. After repeated firings and reloadings the case head will seperate. This may or may not cause a catustrophic firearm failure.</p><p> </p><p>I am sure I have just confused you even more. I don't think I can be expained it any better. Wayne Van Zoll does a real good job in the later edition of Frank de Harts book abut bolt actions rifles.</p><p> </p><p>Nat Lambeth</p></blockquote><p></p>
[QUOTE="Rustystud, post: 339599, member: 9964"] Head Space is exactly that. 1. On a bottle necked rimless case it is a measurement from the "Datum line to the face of the case head." 2. On Belted Magnum cases it is the distance from the front of the belt to the face of the case head. 3. On Rimmed cases it is the distance from the fron of the rim to the back of the rim or case head face. Simply understanding that there has to be a little space between the chamber and the cartridge or it want chamber. As stated pristine target rifles can have tighter chambers. Hunting rifles are generally built a little looser to prevent dirst, dust, unspent powder residue from keeping the bolt from closing. SAAMI "Small Arms and Ammunition Manufactures Institute" are the industry standard. There secs insure that all factory rifles will function with factory ammunition. The allowable varible in chamber and ammunition is .0035" As previously stated a little extra head space alone is not very dangerous. We all know the case will fire form to the chamber. The danger comes in to reloading case that are fired in a gun with excessive head space. Every time one reloads a fired case from a rifle with excessive head space, it is bumping back the shoulder if the case is going bacl to SAAMI Spec. Repeated shoulder bump allows the case to stretch and begin thinning in the web area. After repeated firings and reloadings the case head will seperate. This may or may not cause a catustrophic firearm failure. I am sure I have just confused you even more. I don't think I can be expained it any better. Wayne Van Zoll does a real good job in the later edition of Frank de Harts book abut bolt actions rifles. Nat Lambeth [/QUOTE]
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