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Long Range Hunting & Shooting
300 Holland & Holland ...anybody played with this one ?
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<blockquote data-quote="Bart B" data-source="post: 635204" data-attributes="member: 5302"><p>While your data parallels many others research into cartridge load data comparing similar ones velocities, without pressure data for each one measured the same way and at the same level, it's not credible.</p><p></p><p>Another variable that's virtually always present with folks testing loads for muzzle velocity is the person holding the rifle. The same rifle and ammunition combination shot by different people holding the rifle against their shoulder as it rests atop something on a bench will produce different velocities. Sometimes differing as much as 50 to 100 fps. Which is why SAAMI uses Universal Receivers in floor mounted machine rests that present the same resistance to recoil with precision test barrels rifled and chambered to cartridge specifications. To say nothing of the differences in case neck tension on the bullet, bullet jump to the rifling, bore and groove diameters, primer, and firing pin impact will cause.</p><p></p><p>It's my opinion that the best place on the internet to make cartridge comparisons is SAAMI's web site:</p><p></p><p><a href="http://www.saami.org/specifications_and_information/publications/download/206.pdf" target="_blank">http://www.saami.org/specifications_and_information/publications/download/206.pdf</a></p><p></p><p>That document also lists the details of the standard velocity and pressure test barrels for comparison. It's interesting that the specs for the .300 Weatherby Magnum test barrel bore diameter is larger than both the .300 H&H and Win. Mag.</p><p></p><p>For example, it lists the following for comparing the .300 H&H with the .300 Win. Mag. at 54,000 CUP:</p><p></p><p>.....with 180 grain bullets:</p><p>.300 H&H, 2870 fps</p><p>.300 Win, 2950 fps</p><p></p><p>.....with 220 grain bullets:</p><p>.300 H&H, 2565 fps</p><p>.300 Win, 2665 fps</p></blockquote><p></p>
[QUOTE="Bart B, post: 635204, member: 5302"] While your data parallels many others research into cartridge load data comparing similar ones velocities, without pressure data for each one measured the same way and at the same level, it's not credible. Another variable that's virtually always present with folks testing loads for muzzle velocity is the person holding the rifle. The same rifle and ammunition combination shot by different people holding the rifle against their shoulder as it rests atop something on a bench will produce different velocities. Sometimes differing as much as 50 to 100 fps. Which is why SAAMI uses Universal Receivers in floor mounted machine rests that present the same resistance to recoil with precision test barrels rifled and chambered to cartridge specifications. To say nothing of the differences in case neck tension on the bullet, bullet jump to the rifling, bore and groove diameters, primer, and firing pin impact will cause. It's my opinion that the best place on the internet to make cartridge comparisons is SAAMI's web site: [url]http://www.saami.org/specifications_and_information/publications/download/206.pdf[/url] That document also lists the details of the standard velocity and pressure test barrels for comparison. It's interesting that the specs for the .300 Weatherby Magnum test barrel bore diameter is larger than both the .300 H&H and Win. Mag. For example, it lists the following for comparing the .300 H&H with the .300 Win. Mag. at 54,000 CUP: .....with 180 grain bullets: .300 H&H, 2870 fps .300 Win, 2950 fps .....with 220 grain bullets: .300 H&H, 2565 fps .300 Win, 2665 fps [/QUOTE]
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300 Holland & Holland ...anybody played with this one ?
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