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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
What makes the 6.5 PRC special?
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<blockquote data-quote="MagnumManiac" data-source="post: 1526939" data-attributes="member: 10755"><p>This is just another dis-information statement made by those that DO NOT know the ins and outs of belted magnums. The BELT is part of the solid head of the case, adjacent to the primer cup hole, roughly .080" above the belt is where the web ends in MOST brands of brass, with Norma brass, the web ends about .010" above the belt. This brand of brass is responsible for 100% of the so-called 'BULGE' occurring above the belt.</p><p>To date I have sectioned Norma, Lapua, Winchester, Remington, Federal and Hornady/Frontier 300WM, Winchester 264WM, Weatherby, Norma 270 Weatherby, Winchester, Federal, Remington 338WM, Weatherby 300/340 Weatherby, Remington, Winchester, Norma/Weatherby 375 Weatherby/H&H. </p><p>All of the above had the web end at about .010" above the web in Norma/Weatherby stamped brass, the others varied between .060"-.080" above the belt. This dimension is critical, just as the web thickness is critical, Norma/Weatherby brass averages less than .040" in measurement from primer pocket through to top of web, all other brands are almost double this. This is WHY Norma/Weatherby brass swells just above the web, there is far less material there to support the pressure.</p><p>If this brass came out with SR primers, it would handle far more pressure before deforming to the point that it doesn't go back easily.</p><p>The other brands size ok due to the web taking care of the fact that it doesn't expand on the belt or just above it.</p><p></p><p>As to your last statement, I see 300 Lapua cases in 300WM EVERYTIME I enter my loading room. Yes, it's no longer available, but it is around in certain circles.</p><p></p><p>The argument over a belt causing inaccuracy, short necks causing the same have been disproved time and again.</p><p>Just for your information, a 300H&H held the record at Wimbledon 1000yrd using NEW UNFIRED brass that was headspacing off the belt, and had to fireform to a sloppy chamber, at the time, it was way smaller than any other group ever shot.</p><p></p><p>The 300WM stills holds records to this day and is still competitive, regardless of any new 'special' cartridges that have come in lately.</p><p>The US Marines still use it as a personnel sniper weapon cartridge. If it was hung up with myths and wasn't accurate, would they use it?</p><p>Look up the 'A191' chamber and rifle it was used in, you may re-think your BELIEFS.</p><p></p><p>Cheers.</p></blockquote><p></p>
[QUOTE="MagnumManiac, post: 1526939, member: 10755"] This is just another dis-information statement made by those that DO NOT know the ins and outs of belted magnums. The BELT is part of the solid head of the case, adjacent to the primer cup hole, roughly .080” above the belt is where the web ends in MOST brands of brass, with Norma brass, the web ends about .010” above the belt. This brand of brass is responsible for 100% of the so-called ‘BULGE’ occurring above the belt. To date I have sectioned Norma, Lapua, Winchester, Remington, Federal and Hornady/Frontier 300WM, Winchester 264WM, Weatherby, Norma 270 Weatherby, Winchester, Federal, Remington 338WM, Weatherby 300/340 Weatherby, Remington, Winchester, Norma/Weatherby 375 Weatherby/H&H. All of the above had the web end at about .010” above the web in Norma/Weatherby stamped brass, the others varied between .060”-.080” above the belt. This dimension is critical, just as the web thickness is critical, Norma/Weatherby brass averages less than .040” in measurement from primer pocket through to top of web, all other brands are almost double this. This is WHY Norma/Weatherby brass swells just above the web, there is far less material there to support the pressure. If this brass came out with SR primers, it would handle far more pressure before deforming to the point that it doesn’t go back easily. The other brands size ok due to the web taking care of the fact that it doesn’t expand on the belt or just above it. As to your last statement, I see 300 Lapua cases in 300WM EVERYTIME I enter my loading room. Yes, it’s no longer available, but it is around in certain circles. The argument over a belt causing inaccuracy, short necks causing the same have been disproved time and again. Just for your information, a 300H&H held the record at Wimbledon 1000yrd using NEW UNFIRED brass that was headspacing off the belt, and had to fireform to a sloppy chamber, at the time, it was way smaller than any other group ever shot. The 300WM stills holds records to this day and is still competitive, regardless of any new ‘special’ cartridges that have come in lately. The US Marines still use it as a personnel sniper weapon cartridge. If it was hung up with myths and wasn’t accurate, would they use it? Look up the ‘A191’ chamber and rifle it was used in, you may re-think your BELIEFS. Cheers. [/QUOTE]
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What makes the 6.5 PRC special?
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