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Rifles, Reloading, Optics, Equipment
Reloading
243 AI neck diameter question.
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<blockquote data-quote="J E Custom" data-source="post: 1205533" data-attributes="member: 2736"><p>You should have a "Minimum'' of .0033 thousandths difference from a loaded round to a fired round. </p><p>I recommend .004 difference to prevent any pressure problems and to allow for bras that may be a little thicker (Not Turned).</p><p></p><p>SAMME neck dimensions are .277 and free bore dimensions are .2463 (.0033 larger than the bullet. So if your neck dimensions</p><p>after firing are less than .2463 you do not have a SAMME chamber and may Have a tight neck chamber. </p><p></p><p>If you have the correct diameters before and after firing the necks could be long jamming them into the throat preventing them from expanding at the front of the neck. you can take one of the fired cases and chamfer the inside of the neck with your loading chamfering tool to relieve/increase the</p><p>case mouth and if the bullet goes in all the way after being chamfering on the case mouth, you need to trim your cases .010 shorter (All should be the same once you determine you actual chamber length.</p><p></p><p>I have seen this many times (The neck chamber was to short for the case length).</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1205533, member: 2736"] You should have a "Minimum'' of .0033 thousandths difference from a loaded round to a fired round. I recommend .004 difference to prevent any pressure problems and to allow for bras that may be a little thicker (Not Turned). SAMME neck dimensions are .277 and free bore dimensions are .2463 (.0033 larger than the bullet. So if your neck dimensions after firing are less than .2463 you do not have a SAMME chamber and may Have a tight neck chamber. If you have the correct diameters before and after firing the necks could be long jamming them into the throat preventing them from expanding at the front of the neck. you can take one of the fired cases and chamfer the inside of the neck with your loading chamfering tool to relieve/increase the case mouth and if the bullet goes in all the way after being chamfering on the case mouth, you need to trim your cases .010 shorter (All should be the same once you determine you actual chamber length. I have seen this many times (The neck chamber was to short for the case length). J E CUSTOM [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
243 AI neck diameter question.
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