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Long Range Hunting & Shooting
Yet another "What cartridge?" thread
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<blockquote data-quote="Salmotrutta" data-source="post: 1735110" data-attributes="member: 110250"><p>The .284 and 7mm-08 AI are very interesting ideas indeed (excluding the mag bolt face options for this build) - allowing for seating a high BC bullet such that there is minimal impact to capacity - working well in a magazine limited to 3.34". Back to QL to get the usable case capacities at a COL of 3.34", Assuming a 7mm 180 Hybrid - which is very similar in volume to a 168 LRX...</p><p></p><p>280 AI @ 3.34" usable capacity 62.9g</p><p>.284 Shehane @ 3.18" usable capacity 60.9g (about .29" of shank in neck)</p><p>.284 Win @ 3.18" usable capacity 58.13g (about .29" of shank in neck)</p><p>7mm-08 AI @ 3.05" usable capacity 50.6g (about .29" of shank in neck)</p><p></p><p>So when you run the numbers you really are not "loosing" case capacity with high BC bullets in the .280 AI - its still more than the other viable options and has a higher SAAMI pressure as well. Valid points can be made about efficiency or accuracy potential of the other options but the 280 AI appears to have more net capacity even with heavy bullets seated to a mag length of 3.34"</p><p></p><p>Even if you run the .284 Win at 64,000psi (not sure I would do that) you would get around 2860 fps with a 168 LRX and a 20" barrel - still a little slower (negligible) than a 280 AI with the same bullet, barrel and pressure.</p><p></p><p>Thanks for all the ideas - I would have never worked through these options otherwise!</p></blockquote><p></p>
[QUOTE="Salmotrutta, post: 1735110, member: 110250"] The .284 and 7mm-08 AI are very interesting ideas indeed (excluding the mag bolt face options for this build) - allowing for seating a high BC bullet such that there is minimal impact to capacity - working well in a magazine limited to 3.34". Back to QL to get the usable case capacities at a COL of 3.34", Assuming a 7mm 180 Hybrid - which is very similar in volume to a 168 LRX... 280 AI @ 3.34" usable capacity 62.9g .284 Shehane @ 3.18" usable capacity 60.9g (about .29" of shank in neck) .284 Win @ 3.18" usable capacity 58.13g (about .29" of shank in neck) 7mm-08 AI @ 3.05" usable capacity 50.6g (about .29" of shank in neck) So when you run the numbers you really are not "loosing" case capacity with high BC bullets in the .280 AI - its still more than the other viable options and has a higher SAAMI pressure as well. Valid points can be made about efficiency or accuracy potential of the other options but the 280 AI appears to have more net capacity even with heavy bullets seated to a mag length of 3.34" Even if you run the .284 Win at 64,000psi (not sure I would do that) you would get around 2860 fps with a 168 LRX and a 20" barrel - still a little slower (negligible) than a 280 AI with the same bullet, barrel and pressure. Thanks for all the ideas - I would have never worked through these options otherwise! [/QUOTE]
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