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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: 939136" data-attributes="member: 2736"><p>Sorry to disagree but the reason that you use a standard 243 Head space gauge is so that you can fire form 243 AI safely and without excessive head space. </p><p></p><p>If you use a standard 243 head space go gage It should seat the case at the neck shoulder junction</p><p>and hold the case in place.</p><p></p><p>It is recommended that when head spacing you actually have about .003 to .004 crush on the standard case. this also minimizes neck shortening.</p><p></p><p>The AI head space gage uses the datum line and the standard 243 case has a different datum</p><p>line because of the shoulder angle and will have to much head space if you fire a standard 243 round in it. once fire formed, or if you buy 243 AI ammo it is fine.</p><p></p><p>Some Fire form using the bullet against the lands to maintain head space but the bullets have to be seated farther out and pressures become an issue.</p><p></p><p>So, If you chamber with a 243 AI reamer and buy pre formed brass or loaded ammo then it is recommended that you use the 243AI head space gauge.</p><p></p><p>If you use a 243 AI reamer to chamber with but you want to shoot standard 243 ammo in it and fire form at the same time head space the AI chamber with the standard 243 head space gage.</p><p></p><p>After fire forming, the 243 AI dies will work fine and can be adjusted to fit the chamber.</p><p></p><p>J E CUSTOM</p><p>to</p></blockquote><p></p>
[QUOTE="J E Custom, post: 939136, member: 2736"] Sorry to disagree but the reason that you use a standard 243 Head space gauge is so that you can fire form 243 AI safely and without excessive head space. If you use a standard 243 head space go gage It should seat the case at the neck shoulder junction and hold the case in place. It is recommended that when head spacing you actually have about .003 to .004 crush on the standard case. this also minimizes neck shortening. The AI head space gage uses the datum line and the standard 243 case has a different datum line because of the shoulder angle and will have to much head space if you fire a standard 243 round in it. once fire formed, or if you buy 243 AI ammo it is fine. Some Fire form using the bullet against the lands to maintain head space but the bullets have to be seated farther out and pressures become an issue. So, If you chamber with a 243 AI reamer and buy pre formed brass or loaded ammo then it is recommended that you use the 243AI head space gauge. If you use a 243 AI reamer to chamber with but you want to shoot standard 243 ammo in it and fire form at the same time head space the AI chamber with the standard 243 head space gage. After fire forming, the 243 AI dies will work fine and can be adjusted to fit the chamber. J E CUSTOM to [/QUOTE]
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243 Ackley Improved Problems
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