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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Hexagonal Boron Nitride
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<blockquote data-quote="Pdvdh" data-source="post: 1076904" data-attributes="member: 4191"><p>Chronographed the 300 Win Mag and 7mm Rem Mag today to determine Maximum pressure powder charge and MV with HBN coated bullets and bore, compared to historical Maximum pressure powder charge and MV.</p><p></p><p><u><strong>300 Win Mag</strong> with 25.5 inch Lilja SS barrel, 210gr Berger VLD, Federal 215, IMR 7828, bullets jammed 0.008"</u>:</p><p>Historical uncoated bullet MV=<u>2936</u>fps loaded with <u>73.3</u>gr IMR 7828.</p><p>Max Load HBN bullet/bore MV=2971fps loaded with 74.2gr IMR 7828.</p><p><u>I am able to safely increase MV by ~35fps</u>.</p><p></p><p><u><strong>7mm Rem Mag</strong> with 24 3/8" factory SS Tikka T3 barrel, 168gr Berger VLD, Federal 210, Hodgdon Retumbo, bullets jammed 0.010"</u>:</p><p>Historical uncoated bullet MV=<u>3044</u>fps loaded with <u>74.6</u>gr Retumbo. </p><p>I never reached a maximum pressure load with the 3 bullets I fired today, and I'm beginning to compress the Retumbo powder charge more than I'd prefer. I may try using a Federal 215 primer with Retumbo. Or I may have to switch to a powder with a slightly faster burn rate - perhaps H1000. I'm inclined to think that my safe increase in MV with a maximum pressure load of Retumbo will again be ~35fps.</p></blockquote><p></p>
[QUOTE="Pdvdh, post: 1076904, member: 4191"] Chronographed the 300 Win Mag and 7mm Rem Mag today to determine Maximum pressure powder charge and MV with HBN coated bullets and bore, compared to historical Maximum pressure powder charge and MV. [U][B]300 Win Mag[/B] with 25.5 inch Lilja SS barrel, 210gr Berger VLD, Federal 215, IMR 7828, bullets jammed 0.008"[/U]: Historical uncoated bullet MV=[U]2936[/U]fps loaded with [U]73.3[/U]gr IMR 7828. Max Load HBN bullet/bore MV=2971fps loaded with 74.2gr IMR 7828. [U]I am able to safely increase MV by ~35fps[/U]. [U][B]7mm Rem Mag[/B] with 24 3/8" factory SS Tikka T3 barrel, 168gr Berger VLD, Federal 210, Hodgdon Retumbo, bullets jammed 0.010"[/U]: Historical uncoated bullet MV=[U]3044[/U]fps loaded with [U]74.6[/U]gr Retumbo. I never reached a maximum pressure load with the 3 bullets I fired today, and I'm beginning to compress the Retumbo powder charge more than I'd prefer. I may try using a Federal 215 primer with Retumbo. Or I may have to switch to a powder with a slightly faster burn rate - perhaps H1000. I'm inclined to think that my safe increase in MV with a maximum pressure load of Retumbo will again be ~35fps. [/QUOTE]
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Hexagonal Boron Nitride
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