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Long Range Hunting & Shooting
7mm PRC
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<blockquote data-quote="Jud96" data-source="post: 1696798" data-attributes="member: 69478"><p>If you necked the .300 PRC straight down to 7mm, without changing the shoulder or neck length, it would work perfect with a 3.7" magazine box. The 180 ELD is 1.54" long, subtract the boattail (0.190) and subtract the neck length (.308) that leaves around 1.042" of bullet sticking out of the case:The .300 PRC is 2.580" long, so add those two together, and you get 3.622" with the boattail/bearing surface junction seated right at the neck/shoulder junction.</p><p></p><p>If the 180 ELD touched the rifling at say 3.632" that would give the chamber roughly a 0.242" long throat. Using that same freebore with a Berger 195 in the 7mm-300 PRC, would give a C.O.A.L. of around 3.696" touching the lands and with the bearing surface above the neck/shoulder junction. Seat the Berger 0.020" off and it's at 3.676", the bearing surface is still above the neck/shoulder junction, you have full use of the case capacity, and it will reliably feed in a 3.7" mag box.</p></blockquote><p></p>
[QUOTE="Jud96, post: 1696798, member: 69478"] If you necked the .300 PRC straight down to 7mm, without changing the shoulder or neck length, it would work perfect with a 3.7” magazine box. The 180 ELD is 1.54” long, subtract the boattail (0.190) and subtract the neck length (.308) that leaves around 1.042” of bullet sticking out of the case:The .300 PRC is 2.580” long, so add those two together, and you get 3.622” with the boattail/bearing surface junction seated right at the neck/shoulder junction. If the 180 ELD touched the rifling at say 3.632” that would give the chamber roughly a 0.242” long throat. Using that same freebore with a Berger 195 in the 7mm-300 PRC, would give a C.O.A.L. of around 3.696” touching the lands and with the bearing surface above the neck/shoulder junction. Seat the Berger 0.020” off and it’s at 3.676”, the bearing surface is still above the neck/shoulder junction, you have full use of the case capacity, and it will reliably feed in a 3.7” mag box. [/QUOTE]
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