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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Explain How 7 PRC Has Tighter Tolerances VS 7 MM Rem Mag, without bashing any company
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<blockquote data-quote="VinceMule" data-source="post: 2994390" data-attributes="member: 122164"><p>I have run loads with pressure off my 7 STW, 7 Mag, and 300WM. Primer pockets give up the first in Rem brass, but it is hard to switch when the groups are so tiny. So, I have an Ammo can full of new brass. </p><p></p><p>When a guy has his reamer ground by JGS or Manson, it would be a great time to allow for this issue on case length. Honestly, till this discussion, I just figured the growth was normal, and since my High-pressure loads do not last long(5-6 firings), I just figured it was par for the course, these are hunting rifles, not target rifles. </p><p></p><p>I have a 7 Rem Mag "match" reamer and will look at the print to see if it is shorter, I doubt it. </p><p></p><p>I have been shooting the 7 Mag since 1978, I may have seen 3 Remington cases develop a line about .300-.400 in front of the Web which indicated a case head separation was about to happen, and I have had one case head separation, easily removed with a 45 caliber pistol brush.</p><p></p><p>There is another real can of worms we deal with, and that is the difference between web dia in the chamber, the web dia the die sizes to and spring back. Often, you have to push the shoulder back much further than you like to size the web dia to where the bolt is closing easily(0.0005 very often).</p><p></p><p> Reloaders are getting advanced enough to deal with these two issues separately with different dies made for each(ring die and shoulder bumper). I hope, this is one area in which we may see some corrections being made in the PRC line of cases.</p></blockquote><p></p>
[QUOTE="VinceMule, post: 2994390, member: 122164"] I have run loads with pressure off my 7 STW, 7 Mag, and 300WM. Primer pockets give up the first in Rem brass, but it is hard to switch when the groups are so tiny. So, I have an Ammo can full of new brass. When a guy has his reamer ground by JGS or Manson, it would be a great time to allow for this issue on case length. Honestly, till this discussion, I just figured the growth was normal, and since my High-pressure loads do not last long(5-6 firings), I just figured it was par for the course, these are hunting rifles, not target rifles. I have a 7 Rem Mag "match" reamer and will look at the print to see if it is shorter, I doubt it. I have been shooting the 7 Mag since 1978, I may have seen 3 Remington cases develop a line about .300-.400 in front of the Web which indicated a case head separation was about to happen, and I have had one case head separation, easily removed with a 45 caliber pistol brush. There is another real can of worms we deal with, and that is the difference between web dia in the chamber, the web dia the die sizes to and spring back. Often, you have to push the shoulder back much further than you like to size the web dia to where the bolt is closing easily(0.0005 very often). Reloaders are getting advanced enough to deal with these two issues separately with different dies made for each(ring die and shoulder bumper). I hope, this is one area in which we may see some corrections being made in the PRC line of cases. [/QUOTE]
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Explain How 7 PRC Has Tighter Tolerances VS 7 MM Rem Mag, without bashing any company
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