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Rifles, Reloading, Optics, Equipment
Reloading
chicken or egg - seating depth or powder
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<blockquote data-quote="Bart B" data-source="post: 803359" data-attributes="member: 5302"><p>J E Custom says, when ready to charge cases:1/50th of a grain increments? That's about one kernel of powder or less. Do you mean 0.2 grain, 1/5th grain? I think so. You can join the "Mistyper's Club." I'm a member, too.</p><p></p><p>MagnumManiac sez:This has often been claimed. Nobody has ever proved it timing barrel whip versus bullet exit. But it's been debunked time and time again when top competitors in international competition all using the same ammo in all sorts of barrels having different resonant/harmonic frequencies, chamber and bore/groove dimensions shoot it into 1/2 MOA at 600 yards. If you're basing this on the popular OCW theory, note that theory has several flaws in it. Biggest one is how fast sound waves travel in stainless steel; it ain't right. Second one is that high frequency sound speed stated in OCW theory (18,000 Hz) is not what causes the greatest amount of muzzle angle spread. It's a much lower frequency which is a harmonic multiple of the barrel action's low resonant frequency of 50 to 150 Hz.</p><p></p><p>Then there's this oft-time claim: Get 100 rifle shooters with one rifle and its ammo that's been proved to shoot 1/4 MOA at 100 yards. Have those 100 people shoot a 5 shot group at 100 yards. Those groups will range from just under 1/3 inch to about 2 inches. Maybe bigger.</p></blockquote><p></p>
[QUOTE="Bart B, post: 803359, member: 5302"] J E Custom says, when ready to charge cases:1/50th of a grain increments? That's about one kernel of powder or less. Do you mean 0.2 grain, 1/5th grain? I think so. You can join the "Mistyper's Club." I'm a member, too. MagnumManiac sez:This has often been claimed. Nobody has ever proved it timing barrel whip versus bullet exit. But it's been debunked time and time again when top competitors in international competition all using the same ammo in all sorts of barrels having different resonant/harmonic frequencies, chamber and bore/groove dimensions shoot it into 1/2 MOA at 600 yards. If you're basing this on the popular OCW theory, note that theory has several flaws in it. Biggest one is how fast sound waves travel in stainless steel; it ain't right. Second one is that high frequency sound speed stated in OCW theory (18,000 Hz) is not what causes the greatest amount of muzzle angle spread. It's a much lower frequency which is a harmonic multiple of the barrel action's low resonant frequency of 50 to 150 Hz. Then there's this oft-time claim: Get 100 rifle shooters with one rifle and its ammo that's been proved to shoot 1/4 MOA at 100 yards. Have those 100 people shoot a 5 shot group at 100 yards. Those groups will range from just under 1/3 inch to about 2 inches. Maybe bigger. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
chicken or egg - seating depth or powder
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