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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
7mm or 30 cal? Just for curiosity’s sake
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<blockquote data-quote="Paladin300" data-source="post: 2178839" data-attributes="member: 115299"><p>What you say is true. I too like the 6.5s but I am not a fan of the extreme overbore cartridges. While it is true that SD is what matters, in order to obtain the same BC and performance in the 6.5s and 7s you get out of the 30s and 338s you have to go extreme overbore which results in a rapid loss of barrel life. For example, the 30-06 vs the 30-378 you mentioned, you get five times the barrel life with the 06 as you do with the 378. That extra velocity and extra BC come at a considerable cost in efficiency. My last 30-378 took 115 grains of H50BMG to perform at the same level as my 338 RUM, which out performs the 30-378 by several hundred yards because of extremely heavy, high BC bullets and does it with 85.5 grains of R23. By going up in bullet diameter you are able to accomplish similar task more efficiently, place more weight and energy on target with slightly, though often significantly better wound channels. Again, the smaller bores fly flatter inside a 1000 yards but the bigger bores hit harder.</p><p></p><p>As far as recoil goes, a 7mm shooting a 180 grain bullet will in theory recoil harder than a 30 cal shooting the same weight bullet at identical velocities. It is a matter of physics. It takes more energy to accomplish the same task with the smaller diameter bullet. The smaller bores recoil less because most often they are shooting a lighter bullet. IMHO recoil management has a lot to do with the weight of the rifle, the construction of the rifle and the stock more than the caliber when shooting identical bullet weights at identical velocities. I understand the argument for the 7s but I believe for LRH purposes on large and dangers game the 30s do it more effectively and efficiently.</p><p></p><p>All that said, I prefer the 7mm-08 and 284 over the 308, but I prefer the 300 WM over the 7mm Rem Mag and I prefer the 338 Rum over the 300 WM. The longer the range and the bigger the critter, the bigger the gun.</p></blockquote><p></p>
[QUOTE="Paladin300, post: 2178839, member: 115299"] What you say is true. I too like the 6.5s but I am not a fan of the extreme overbore cartridges. While it is true that SD is what matters, in order to obtain the same BC and performance in the 6.5s and 7s you get out of the 30s and 338s you have to go extreme overbore which results in a rapid loss of barrel life. For example, the 30-06 vs the 30-378 you mentioned, you get five times the barrel life with the 06 as you do with the 378. That extra velocity and extra BC come at a considerable cost in efficiency. My last 30-378 took 115 grains of H50BMG to perform at the same level as my 338 RUM, which out performs the 30-378 by several hundred yards because of extremely heavy, high BC bullets and does it with 85.5 grains of R23. By going up in bullet diameter you are able to accomplish similar task more efficiently, place more weight and energy on target with slightly, though often significantly better wound channels. Again, the smaller bores fly flatter inside a 1000 yards but the bigger bores hit harder. As far as recoil goes, a 7mm shooting a 180 grain bullet will in theory recoil harder than a 30 cal shooting the same weight bullet at identical velocities. It is a matter of physics. It takes more energy to accomplish the same task with the smaller diameter bullet. The smaller bores recoil less because most often they are shooting a lighter bullet. IMHO recoil management has a lot to do with the weight of the rifle, the construction of the rifle and the stock more than the caliber when shooting identical bullet weights at identical velocities. I understand the argument for the 7s but I believe for LRH purposes on large and dangers game the 30s do it more effectively and efficiently. All that said, I prefer the 7mm-08 and 284 over the 308, but I prefer the 300 WM over the 7mm Rem Mag and I prefer the 338 Rum over the 300 WM. The longer the range and the bigger the critter, the bigger the gun. [/QUOTE]
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7mm or 30 cal? Just for curiosity’s sake
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