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Rifles, Reloading, Optics, Equipment
Gunsmithing
243 or 243 ai
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<blockquote data-quote="westcliffe01" data-source="post: 812314" data-attributes="member: 35183"><p>Here is a picture of a "virgin" and fireformed case for comparison.</p><p></p><p>I recommend doing the right thing and using a true 243AI "go" gauge to set head space on your barrel. The 243 (in fact 308 Win case family) go gauge is not interchangeable with an Ackley gauge. MansonReamers.com carry all the popular Ackley gauges and can make customs, so no excuse to use the wrong gauge. Given the difference in shoulder angles, it should be obvious why you want to use the right gauge.</p><p></p><p>You can tell a few things from the pic below. First of all, the height to the base of the neck difference can clearly be recognized. The AI chamber is shorter in this regard, deliberately, so that the base of the cartridge is forced tight against the bolt face. Second, the extra case volume can be recognized. The 243 case does not have a bunch of taper to begin with so it does not benefit from the "Ackleying" as much as others.</p><p></p><p>Having said all that, I am not having any issues with my fireforming loads, they are just as good as shooting any ammo and given the reduced barrel life, I do not intend to waste my barrel life. My magazine allows the bullets to be seated to 2.9" overall length, which exceeds the throat dimension. But then that is what is advocated by David Tubb, that way the bullet is guaranteed to be jammed securely when it is loaded, as opposed to having a potentially variable jump.</p><p></p><p><img src="http://www.fotoshack.us/fotos/59046243AI.JPG" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p></blockquote><p></p>
[QUOTE="westcliffe01, post: 812314, member: 35183"] Here is a picture of a "virgin" and fireformed case for comparison. I recommend doing the right thing and using a true 243AI "go" gauge to set head space on your barrel. The 243 (in fact 308 Win case family) go gauge is not interchangeable with an Ackley gauge. MansonReamers.com carry all the popular Ackley gauges and can make customs, so no excuse to use the wrong gauge. Given the difference in shoulder angles, it should be obvious why you want to use the right gauge. You can tell a few things from the pic below. First of all, the height to the base of the neck difference can clearly be recognized. The AI chamber is shorter in this regard, deliberately, so that the base of the cartridge is forced tight against the bolt face. Second, the extra case volume can be recognized. The 243 case does not have a bunch of taper to begin with so it does not benefit from the "Ackleying" as much as others. Having said all that, I am not having any issues with my fireforming loads, they are just as good as shooting any ammo and given the reduced barrel life, I do not intend to waste my barrel life. My magazine allows the bullets to be seated to 2.9" overall length, which exceeds the throat dimension. But then that is what is advocated by David Tubb, that way the bullet is guaranteed to be jammed securely when it is loaded, as opposed to having a potentially variable jump. [IMG]http://www.fotoshack.us/fotos/59046243AI.JPG[/IMG] [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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243 or 243 ai
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