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Long Range Hunting & Shooting
6.5 Credmoor vs 7mm-08
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<blockquote data-quote="Hondo64d" data-source="post: 1260811" data-attributes="member: 1390"><p>It is most certainly over the specs that Lapua set for the case, 63,000 PSI. But the reality is the x47 case will handle a bunch more than that, especially when coupled with an action that has a small firing pin and hole and a small ejector plunger and hole, both of which help prevent brass flow. I don't want to find out where the pressure limit is for the x47 brass is, so I won't load any hotter than what a CM or .260 will do velocity wise. My last custom .260's favored load would push a 130gr VLD at about 2940 from a 24" Brux barrel. If I pushed it any more, I would start getting ejector swipes on the case head. That usually happens at about 70,000 PSI or a little more. That tells me that if I am pushing a 130gr VLD at more than 2940 from a 6.5x47 with its smaller capacity, I am certainly exceeding 70,000 PSI.</p><p></p><p>Do I load my 6.5x47 to more than the 63,000 PSI spec? Certainly. But there are limits. If I start seeing brass flow or primer pockets start to loosen after a few loads, it's time to back off, as those are visible signs the brass is starting to be stressed. My favored loads from my Criterion 26" barrel push a 130gr VLD at about 2850 and a 140gr Amax or ELD at about 2790.</p><p></p><p>John</p></blockquote><p></p>
[QUOTE="Hondo64d, post: 1260811, member: 1390"] It is most certainly over the specs that Lapua set for the case, 63,000 PSI. But the reality is the x47 case will handle a bunch more than that, especially when coupled with an action that has a small firing pin and hole and a small ejector plunger and hole, both of which help prevent brass flow. I don't want to find out where the pressure limit is for the x47 brass is, so I won't load any hotter than what a CM or .260 will do velocity wise. My last custom .260's favored load would push a 130gr VLD at about 2940 from a 24" Brux barrel. If I pushed it any more, I would start getting ejector swipes on the case head. That usually happens at about 70,000 PSI or a little more. That tells me that if I am pushing a 130gr VLD at more than 2940 from a 6.5x47 with its smaller capacity, I am certainly exceeding 70,000 PSI. Do I load my 6.5x47 to more than the 63,000 PSI spec? Certainly. But there are limits. If I start seeing brass flow or primer pockets start to loosen after a few loads, it's time to back off, as those are visible signs the brass is starting to be stressed. My favored loads from my Criterion 26" barrel push a 130gr VLD at about 2850 and a 140gr Amax or ELD at about 2790. John [/QUOTE]
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6.5 Credmoor vs 7mm-08
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