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Rifles, Reloading, Optics, Equipment
Reloading
7mm Rem. Mag. load help
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<blockquote data-quote="Bart B" data-source="post: 499497" data-attributes="member: 5302"><p>The main reason there's hundreds of printed loads for a given bullet in a given cartridge is easy to understand. 99% of them are developed by someone shooting a rifle resting atop something on a bench, holding the rifle and pulling the trigger themselves typically shooting a couple of 5-shot groups. There's two big problems with this.</p><p></p><p>First, unless one shoots at least 20 shots per test group, the statistical confidence level it represents real accuracy at least 80% of the time won't be attained. One 20-shot test group's about 4 times better than four 5-shot ones averaged.</p><p></p><p>Second, maybe 1 in 1000 people can shoot a rifle with a 2-pound or heavier trigger with more than 10 foot-pounds of recoil held against their shoulder as it rests on something atop a bench exactly the same for each shot. Everyone else's non-repeatable technique opens up groups considerably.</p><p></p><p>Why else would there be hundreds of loads listed for that bullet-cartridge combination? To say nothing of the wide range of rifle quality used to develop loads in the first place along with a wide range of reloading tools and techniques used.</p></blockquote><p></p>
[QUOTE="Bart B, post: 499497, member: 5302"] The main reason there's hundreds of printed loads for a given bullet in a given cartridge is easy to understand. 99% of them are developed by someone shooting a rifle resting atop something on a bench, holding the rifle and pulling the trigger themselves typically shooting a couple of 5-shot groups. There's two big problems with this. First, unless one shoots at least 20 shots per test group, the statistical confidence level it represents real accuracy at least 80% of the time won't be attained. One 20-shot test group's about 4 times better than four 5-shot ones averaged. Second, maybe 1 in 1000 people can shoot a rifle with a 2-pound or heavier trigger with more than 10 foot-pounds of recoil held against their shoulder as it rests on something atop a bench exactly the same for each shot. Everyone else's non-repeatable technique opens up groups considerably. Why else would there be hundreds of loads listed for that bullet-cartridge combination? To say nothing of the wide range of rifle quality used to develop loads in the first place along with a wide range of reloading tools and techniques used. [/QUOTE]
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Reloading
7mm Rem. Mag. load help
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