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Rifles, Reloading, Optics, Equipment
Reloading
243 Ackley Improved Problems
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<blockquote data-quote="J E Custom" data-source="post: 1422487" data-attributes="member: 2736"><p>This has come up many times and will probably never be agreed upon but it can make a difference if it is done the way PO Ackley designed and intended for it to be.</p><p></p><p>Most if not all of the AIs are set up to use the standard headspace gauge for that cartridge with only one exception The 280 AI is done either way depending on the brass you intend to use. if you want to use standard 280 ammo and brass to fire form, you should use the standard headspace gauge with .004 thousandths crush fit to hold the brass in place while it is fire formed. If you intend to use new Ackley brass (It is formed to fit the new SAMME specification which is.014 to .016 thousandths longer than the standard 280 remington) and if you fire form standard 280 brass or ammo there is a possibility of case head separation from to much head space.</p><p></p><p>All other Ackley's except the wild cat versions are done using the standard head space gauges with the crush fit (.004).that uses the neck shoulder junction for this measurement instead of the Datum line normally used in shouldered cases.</p><p></p><p>As far as closing the bolt, .004 thousandths does not produce much resistance to closing. It essentially take out any slack in the head space and prevents the case from growing or moving very much while fire forming. it also makes the fire forming of parent cartridges very accurate and usable for hunting instead of taking the extra step to fire form and then load for hunting.</p><p></p><p>If you choose to buy an AI headspace gauge for anything "But" the 280 AI it should have this compression built in and will be .004 thousandths shorter at the neck shoulder junction to accomplish the same tight fit on the standard cartridge for fire forming.</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1422487, member: 2736"] This has come up many times and will probably never be agreed upon but it can make a difference if it is done the way PO Ackley designed and intended for it to be. Most if not all of the AIs are set up to use the standard headspace gauge for that cartridge with only one exception The 280 AI is done either way depending on the brass you intend to use. if you want to use standard 280 ammo and brass to fire form, you should use the standard headspace gauge with .004 thousandths crush fit to hold the brass in place while it is fire formed. If you intend to use new Ackley brass (It is formed to fit the new SAMME specification which is.014 to .016 thousandths longer than the standard 280 remington) and if you fire form standard 280 brass or ammo there is a possibility of case head separation from to much head space. All other Ackley's except the wild cat versions are done using the standard head space gauges with the crush fit (.004).that uses the neck shoulder junction for this measurement instead of the Datum line normally used in shouldered cases. As far as closing the bolt, .004 thousandths does not produce much resistance to closing. It essentially take out any slack in the head space and prevents the case from growing or moving very much while fire forming. it also makes the fire forming of parent cartridges very accurate and usable for hunting instead of taking the extra step to fire form and then load for hunting. If you choose to buy an AI headspace gauge for anything "But" the 280 AI it should have this compression built in and will be .004 thousandths shorter at the neck shoulder junction to accomplish the same tight fit on the standard cartridge for fire forming. J E CUSTOM [/QUOTE]
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243 Ackley Improved Problems
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