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Rifles, Reloading, Optics, Equipment
Reloading
Ackley Improved Education
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<blockquote data-quote="Tac-O" data-source="post: 3069068" data-attributes="member: 109994"><p>I think most factory cartridges don't follow Ackley's case dimension standards (40* shoulder and 0.10/in case taper) because of the potential for feeding issues but likely the weight is more towards the case taper hiding pressure signs and having potential for extraction issues. </p><p></p><p>I think the biggest benefit is likely usually reduced trimming, but can significantly increase powder capacity depending on the cartridge. 260 rem and 6.5 Sweden both have significant gains in powder capacity. 308 win ai, not so much. </p><p></p><p>A benefit of minimal case capacity increase could be for being able to hit a certain powder charge weight and bullet combo that shoots particularly well. Alex Wheeler's work is a good example of improving cartridges. He does iterations on chambers to find what works best for a particular bullet. BUT, that is for a single use scenario. If you're looking for general speed and accuracy, that may not fit your specific use case. </p><p></p><p>For gunsmithing, doing AI work is not as simple as running the AI reamer in.... To do it properly the barrel needs to be set back so that a 0.004 headspace crush fit is obtained when loading the factory case. Which brings another benefit; being able to shoot factory ammo in the AI chamber. </p><p></p><p>I did a 30-284ai, mostly for slight powder capacity increase and reduced trimming. The jury is out on if it would be better than a straight 30-284 because my first chamber cut with the reamer was sloppy. That's my one experience with an AI chamber aside from researching it heavily.</p></blockquote><p></p>
[QUOTE="Tac-O, post: 3069068, member: 109994"] I think most factory cartridges don't follow Ackley's case dimension standards (40* shoulder and 0.10/in case taper) because of the potential for feeding issues but likely the weight is more towards the case taper hiding pressure signs and having potential for extraction issues. I think the biggest benefit is likely usually reduced trimming, but can significantly increase powder capacity depending on the cartridge. 260 rem and 6.5 Sweden both have significant gains in powder capacity. 308 win ai, not so much. A benefit of minimal case capacity increase could be for being able to hit a certain powder charge weight and bullet combo that shoots particularly well. Alex Wheeler's work is a good example of improving cartridges. He does iterations on chambers to find what works best for a particular bullet. BUT, that is for a single use scenario. If you're looking for general speed and accuracy, that may not fit your specific use case. For gunsmithing, doing AI work is not as simple as running the AI reamer in.... To do it properly the barrel needs to be set back so that a 0.004 headspace crush fit is obtained when loading the factory case. Which brings another benefit; being able to shoot factory ammo in the AI chamber. I did a 30-284ai, mostly for slight powder capacity increase and reduced trimming. The jury is out on if it would be better than a straight 30-284 because my first chamber cut with the reamer was sloppy. That's my one experience with an AI chamber aside from researching it heavily. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Ackley Improved Education
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