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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
6.5X47 Lap imp Quick Load help.
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<blockquote data-quote="Kevin Thomas" data-source="post: 474155" data-attributes="member: 15748"><p>That may be part of the problem; several of those signs lie. Primer appearance is one of the most commonly referred to pressure signs, and they will tell you a thing or two about pressures. They'll also lie to you like a politician in an election year. I've seen far too many fired primers that most would look at an immediately declare the load to have been far, far too hot, when they were actually quite mild. Headspace issues can cause that. I've also seen primers that looked like the load was rather mild, when in fact it was **** near proof load levels. Like I said, they lie. Bolt lift is another that becomes unreliable when dealing with cases with minimal body taper. As I mentioned, stick a case in a Gibbs and you've already gone well beyond proof load pressures. </p><p> </p><p>Normal absolute max for the 6.5x47 is (I believe) about 62K, normal loadings probably running an average of around 55K PSI, but I'd have to verify that to be sure. In most cases, I'd want to maintain the same pressure range as the original parent case. The advantage lies in the added capacity of an Improved case, and <u>not</u> by running higher pressures. </p><p> </p><p>In the case of the 6.5x47, I wouldn't expect too much of an improvement in velocity, simply because the case isn't really "improved" that much. It has a reasonably sharp shoulder and not too much body taper. In short, there's not much to blow out when you fireform. Cases like the 22-250 or 257 Roberts show a very pronounced increase, due to their extreme (by modern standards) body taper and relatively mild shoulder angles. Not knocking your choice here, just saying, not all cases benefit equally by the Ackley treatment. P.O. knew this, and said as much about several cartridges.</p></blockquote><p></p>
[QUOTE="Kevin Thomas, post: 474155, member: 15748"] That may be part of the problem; several of those signs lie. Primer appearance is one of the most commonly referred to pressure signs, and they will tell you a thing or two about pressures. They'll also lie to you like a politician in an election year. I've seen far too many fired primers that most would look at an immediately declare the load to have been far, far too hot, when they were actually quite mild. Headspace issues can cause that. I've also seen primers that looked like the load was rather mild, when in fact it was **** near proof load levels. Like I said, they lie. Bolt lift is another that becomes unreliable when dealing with cases with minimal body taper. As I mentioned, stick a case in a Gibbs and you've already gone well beyond proof load pressures. Normal absolute max for the 6.5x47 is (I believe) about 62K, normal loadings probably running an average of around 55K PSI, but I'd have to verify that to be sure. In most cases, I'd want to maintain the same pressure range as the original parent case. The advantage lies in the added capacity of an Improved case, and [U]not[/U] by running higher pressures. In the case of the 6.5x47, I wouldn't expect too much of an improvement in velocity, simply because the case isn't really "improved" that much. It has a reasonably sharp shoulder and not too much body taper. In short, there's not much to blow out when you fireform. Cases like the 22-250 or 257 Roberts show a very pronounced increase, due to their extreme (by modern standards) body taper and relatively mild shoulder angles. Not knocking your choice here, just saying, not all cases benefit equally by the Ackley treatment. P.O. knew this, and said as much about several cartridges. [/QUOTE]
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6.5X47 Lap imp Quick Load help.
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