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Rifles, Reloading, Optics, Equipment
Reloading
Powder charge and seating depth
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<blockquote data-quote="Hugnot" data-source="post: 2434109" data-attributes="member: 115658"><p>Powder charge:</p><p>Some cartridges, like .300 WM are loaded to fit 3.34-inch magazine lengths when actually the cartridge would be best suited to be loaded at 3.6 inches and gain about 8% more powder capacity (powder charge increase). True magnum length actions intended for .300 H&H & .375 H&H would work. My rifle has no magazine being a single shot and has a chamber cut to conform to a sample 3.6-inch inert round. To a lesser extent, same for the .243 Win, a sample 2.825-inch COAL inert round, that fits inside the magazine, was provided for the chamber cutting. Berger 6mm, 95 grain VLD bullets are seated with COAL somewhat shorter than 2.8 COAL. Rounds feed real good & accuracy is good, in compliance with Berger directives in regard to seating depths. The 6mm 95 VLD has a real good form factor, lighter weight for higher velocities but has an abrupt ogive transition requiring seating depth adjustments. </p><p></p><p>Bullet type - tangent ogive bullets, as defined in the Berger manual, are more forgiving than the secant ogive variety in regard to seating depth ... Tangent - "smooth junction with bearing surface good for self-aligning, Secant - "abrupt juncture, not good for self-aligning... sensitive to seating depth". Apparently, this has led to the "hybrid" type bullet, in an effort to have similar form factors as a secant ogive bullet but with the self-aligning features as a tangent ogive bullet.</p><p></p><p>Looking at the Berger VLD bullets an abrupt ogive transition is easily observed. The transition is not as easily seen in Hornady bullets, also secant ogive types. I seat both brands deep enough for clearance & periodically adjust for throat erosion. Berger has made zillions of VLD bullets and there has to be validity in seating depth recommendations. Having a nice precise chamber also helps.</p></blockquote><p></p>
[QUOTE="Hugnot, post: 2434109, member: 115658"] Powder charge: Some cartridges, like .300 WM are loaded to fit 3.34-inch magazine lengths when actually the cartridge would be best suited to be loaded at 3.6 inches and gain about 8% more powder capacity (powder charge increase). True magnum length actions intended for .300 H&H & .375 H&H would work. My rifle has no magazine being a single shot and has a chamber cut to conform to a sample 3.6-inch inert round. To a lesser extent, same for the .243 Win, a sample 2.825-inch COAL inert round, that fits inside the magazine, was provided for the chamber cutting. Berger 6mm, 95 grain VLD bullets are seated with COAL somewhat shorter than 2.8 COAL. Rounds feed real good & accuracy is good, in compliance with Berger directives in regard to seating depths. The 6mm 95 VLD has a real good form factor, lighter weight for higher velocities but has an abrupt ogive transition requiring seating depth adjustments. Bullet type - tangent ogive bullets, as defined in the Berger manual, are more forgiving than the secant ogive variety in regard to seating depth ... Tangent - "smooth junction with bearing surface good for self-aligning, Secant - "abrupt juncture, not good for self-aligning... sensitive to seating depth". Apparently, this has led to the "hybrid" type bullet, in an effort to have similar form factors as a secant ogive bullet but with the self-aligning features as a tangent ogive bullet. Looking at the Berger VLD bullets an abrupt ogive transition is easily observed. The transition is not as easily seen in Hornady bullets, also secant ogive types. I seat both brands deep enough for clearance & periodically adjust for throat erosion. Berger has made zillions of VLD bullets and there has to be validity in seating depth recommendations. Having a nice precise chamber also helps. [/QUOTE]
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Powder charge and seating depth
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