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Rifles, Reloading, Optics, Equipment
Reloading
.375 H&H Fireform to .375 WBY?
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<blockquote data-quote="Kennibear" data-source="post: 899677" data-attributes="member: 51650"><p>The order of case capacity is: H&H, Ruger, 375 Weatherby, RUM, 378 Weatherby.</p><p></p><p>One parameter that is not measurable for most shooters is pressure. Most hand loads are high pressure and most factory loads are far from it. Most recent experience with factory loads (most of my guns never see factory ammo) is with a friend's 7mm RemMag. Hornady Superformance 162 gr SST was closest to claimed velocity (-22 fps and the barrel was 2" shorter than factory) and the Remington Corelock was the least (2700fps vs. 3000fps claimed). Factory ammo not performing up to par is S.O.P. That's why I recommend to beginners to get a chronograph as their first purchase. Apples to apples has both cartridges at the same pressure.</p><p></p><p>When two same caliber cartridges are compared the higher capacity case wins. Short fat cases don't deliver higher velocities (as proved by P.O.Ackley) but they are <em>MUCH</em> more consistent. Fat cases deliver very low shot to shot variations. But Weatherby's claim of venturi effect has never been proven. It is based on the PMVF wildcats of the 30's.</p><p></p><p>Start pouring powder into both the RUM and 375 Weatherby and when the primers start cratering the RUM will be burning more powder and developing more velocity. To really do this right you would use the same barrel and rechamber.</p><p></p><p>Just the history of wildcaters and reloaders pushing the limits speaking here. If there was a magical case shape someone would have found it and the ammo companies would have made them rich with licensing fees.</p><p></p><p>KB</p></blockquote><p></p>
[QUOTE="Kennibear, post: 899677, member: 51650"] The order of case capacity is: H&H, Ruger, 375 Weatherby, RUM, 378 Weatherby. One parameter that is not measurable for most shooters is pressure. Most hand loads are high pressure and most factory loads are far from it. Most recent experience with factory loads (most of my guns never see factory ammo) is with a friend's 7mm RemMag. Hornady Superformance 162 gr SST was closest to claimed velocity (-22 fps and the barrel was 2" shorter than factory) and the Remington Corelock was the least (2700fps vs. 3000fps claimed). Factory ammo not performing up to par is S.O.P. That's why I recommend to beginners to get a chronograph as their first purchase. Apples to apples has both cartridges at the same pressure. When two same caliber cartridges are compared the higher capacity case wins. Short fat cases don't deliver higher velocities (as proved by P.O.Ackley) but they are [I]MUCH[/I] more consistent. Fat cases deliver very low shot to shot variations. But Weatherby's claim of venturi effect has never been proven. It is based on the PMVF wildcats of the 30's. Start pouring powder into both the RUM and 375 Weatherby and when the primers start cratering the RUM will be burning more powder and developing more velocity. To really do this right you would use the same barrel and rechamber. Just the history of wildcaters and reloaders pushing the limits speaking here. If there was a magical case shape someone would have found it and the ammo companies would have made them rich with licensing fees. KB [/QUOTE]
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Reloading
.375 H&H Fireform to .375 WBY?
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