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Rifles, Reloading, Optics, Equipment
Reloading
Brass Separation Above Belt
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<blockquote data-quote="J E Custom" data-source="post: 1383805" data-attributes="member: 2736"><p>I don't know what to say about checking head space this way. First a rimed case does not headspace on anything but the rim and measuring the case fired or not Is asking for trouble.</p><p></p><p>There is only one proper way to set or check head space, And that is with a HEAD SPACE GAUGE. It is based on the SAMME dimensions for that cartridge and does not re bound or spring back like brass does. Anyone that headspaces using the brass is not a gunsmith and should not be allowed to touch anyone's rifle except his own.</p><p></p><p>It is always best to buy the head space gauge from the same reamer manufacture so they match. the reamer does not set the head space, the head space gauge does, Different Gun Smiths will head space differently within a few thousandths depending on the rifles purpose and if it will be reloaded for or factory ammo is to be used.</p><p></p><p>A ridged gauge is the only way to measure head space and I recommend that the ejector be removed before head spacing to prevent false readings.</p><p></p><p>A Go Gauge will work for both setting head space and checking head space by placing shims between the bolt face and the go gauge until the locking lugs show a slight resistance. Then measure the thickness of the shims and that will tell you the amount of head space you have.</p><p>(How much more than the minimum for this cartridge) it should not be more than .006 or it may fail.</p><p></p><p>If the weapon is very old and used, a No go gauge will tell you if it has to much head space. No go gauges are normally .006 to .008 thousandths longer than the SAMME specification and/or the Go Gauge.</p><p>Most "Gunsmiths" will head space from .0005 to .004 max depending on the intended use for an all round head space, most will set head space at .002 to .003. But, after it is fired once, the amount of head space for some types of cases are dependent on the Reloader and the setting of his dies. Rimed cases retain the head space originally set by the smith.</p><p></p><p>On a rimed case the length of the case has nothing to do with head space. Primers are not reliable ways of checking head space for many reason one being Primer pockets vary in depth and so do primers so The back of the case head is the starting point no matter what type of cartage case is used the only other point from the back of the case head is the front of the case head on a rimed case, the front of the belt on a belted case, and the Datum line of the shouldered case with no belt . the only exception is rimless cases that use the case mouth trim length to head space on (like the 45 ACP and other rimless cases) this still requires a Go gauge to do properly.</p><p></p><p>If a go gauge is used properly for head spacing, the first firing should not cause/create case head separation. If it was head spaced incorrectly, It can/may cause case head separation on the first firing.</p><p></p><p>Correct head space will not prevent separation if the case is oversized many times and served with high pressures it is not uncommon to see.</p><p></p><p>I cant stress the importance of proper head space enough. please do not use anything but the proper head space gauge for safety and function.</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1383805, member: 2736"] I don't know what to say about checking head space this way. First a rimed case does not headspace on anything but the rim and measuring the case fired or not Is asking for trouble. There is only one proper way to set or check head space, And that is with a HEAD SPACE GAUGE. It is based on the SAMME dimensions for that cartridge and does not re bound or spring back like brass does. Anyone that headspaces using the brass is not a gunsmith and should not be allowed to touch anyone's rifle except his own. It is always best to buy the head space gauge from the same reamer manufacture so they match. the reamer does not set the head space, the head space gauge does, Different Gun Smiths will head space differently within a few thousandths depending on the rifles purpose and if it will be reloaded for or factory ammo is to be used. A ridged gauge is the only way to measure head space and I recommend that the ejector be removed before head spacing to prevent false readings. A Go Gauge will work for both setting head space and checking head space by placing shims between the bolt face and the go gauge until the locking lugs show a slight resistance. Then measure the thickness of the shims and that will tell you the amount of head space you have. (How much more than the minimum for this cartridge) it should not be more than .006 or it may fail. If the weapon is very old and used, a No go gauge will tell you if it has to much head space. No go gauges are normally .006 to .008 thousandths longer than the SAMME specification and/or the Go Gauge. Most "Gunsmiths" will head space from .0005 to .004 max depending on the intended use for an all round head space, most will set head space at .002 to .003. But, after it is fired once, the amount of head space for some types of cases are dependent on the Reloader and the setting of his dies. Rimed cases retain the head space originally set by the smith. On a rimed case the length of the case has nothing to do with head space. Primers are not reliable ways of checking head space for many reason one being Primer pockets vary in depth and so do primers so The back of the case head is the starting point no matter what type of cartage case is used the only other point from the back of the case head is the front of the case head on a rimed case, the front of the belt on a belted case, and the Datum line of the shouldered case with no belt . the only exception is rimless cases that use the case mouth trim length to head space on (like the 45 ACP and other rimless cases) this still requires a Go gauge to do properly. If a go gauge is used properly for head spacing, the first firing should not cause/create case head separation. If it was head spaced incorrectly, It can/may cause case head separation on the first firing. Correct head space will not prevent separation if the case is oversized many times and served with high pressures it is not uncommon to see. I cant stress the importance of proper head space enough. please do not use anything but the proper head space gauge for safety and function. J E CUSTOM [/QUOTE]
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Brass Separation Above Belt
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