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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
7prc > 7rm ??
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<blockquote data-quote="quandary" data-source="post: 3076561" data-attributes="member: 124624"><p>First of all this has nothing to do with 7PRC or 7RM or 30-06 or whatever other cartridge you care to name. Its Hornady's claimed velocity numbers on the factory ammunition. For example in my 6.5 Creedmore (I haven't bothered with dies for this caliber) with a 24" barrel I get an average of 2,610 shooting 140 ELDMs, the box claims 2,710. Further the swings in velocity are unbelievable going from below 2,600 to as high as 2,690. On the other hand shooting 144 Berger LRHTs I get and average of 2,725 the box claims 2,830. However Berger use 26" barrels for their stated velocities (Hornady uses the industry standard 24" I believe). So my velocity tracks with the Berger claims. Additionally the swing in the Bergers is around 30fps. This has got nothing to do with the hype around the 6.5 Creedmore. It has to do with Hornady doesn't produce particularly good ammunition. It underperforms claims and its inconsistent.</p><p></p><p>Second, the 7PRC was not developed and doesn't claim to be faster than the 7RM. In fact the 7RM's case capacity is slightly larger than the 7PRC case capacity so if anything the 7RM should be faster than the 7PRC. The goal of the 7PRC design and specs is to be a more accurate factory SAAMI spec'd caliber that is capable of using longer, higher BC bullets in a retail rifle. This goal was achieved. Built to SAAMI specs the chamber tolerances are tighter, the COAL is longer, the twist rate is tighter. It is a more accurate round particularly at distance. Additionally because of the high BC bullets that can be used it is faster down range and less effected by wind. Thus flatter shooting with less drift, more accurate. These are undeniable facts. The design of the 7PRC has nothing to do with creating faster muzzle velocity. </p><p></p><p>That said inside of 500 or 600 yards there will be a virtually no difference. Further given the nearly identical case capacity there is no question that anybody could have a barrel cut with tight tolerances and a 1/8 twist and achieve 7PRC performance. The point of the 7PRC is to enable the average Joe to go to the local Cabelas or Sportsmen's Warehouse and buy a rifle off the shelve and be good to go. That goal was achieved.</p></blockquote><p></p>
[QUOTE="quandary, post: 3076561, member: 124624"] First of all this has nothing to do with 7PRC or 7RM or 30-06 or whatever other cartridge you care to name. Its Hornady's claimed velocity numbers on the factory ammunition. For example in my 6.5 Creedmore (I haven't bothered with dies for this caliber) with a 24" barrel I get an average of 2,610 shooting 140 ELDMs, the box claims 2,710. Further the swings in velocity are unbelievable going from below 2,600 to as high as 2,690. On the other hand shooting 144 Berger LRHTs I get and average of 2,725 the box claims 2,830. However Berger use 26" barrels for their stated velocities (Hornady uses the industry standard 24" I believe). So my velocity tracks with the Berger claims. Additionally the swing in the Bergers is around 30fps. This has got nothing to do with the hype around the 6.5 Creedmore. It has to do with Hornady doesn't produce particularly good ammunition. It underperforms claims and its inconsistent. Second, the 7PRC was not developed and doesn't claim to be faster than the 7RM. In fact the 7RM's case capacity is slightly larger than the 7PRC case capacity so if anything the 7RM should be faster than the 7PRC. The goal of the 7PRC design and specs is to be a more accurate factory SAAMI spec'd caliber that is capable of using longer, higher BC bullets in a retail rifle. This goal was achieved. Built to SAAMI specs the chamber tolerances are tighter, the COAL is longer, the twist rate is tighter. It is a more accurate round particularly at distance. Additionally because of the high BC bullets that can be used it is faster down range and less effected by wind. Thus flatter shooting with less drift, more accurate. These are undeniable facts. The design of the 7PRC has nothing to do with creating faster muzzle velocity. That said inside of 500 or 600 yards there will be a virtually no difference. Further given the nearly identical case capacity there is no question that anybody could have a barrel cut with tight tolerances and a 1/8 twist and achieve 7PRC performance. The point of the 7PRC is to enable the average Joe to go to the local Cabelas or Sportsmen's Warehouse and buy a rifle off the shelve and be good to go. That goal was achieved. [/QUOTE]
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