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Long Range Hunting & Shooting
Nosler long range accbond and my experience.
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<blockquote data-quote="Michael Eichele" data-source="post: 891380" data-attributes="member: 1007"><p>You all have illustrated exactly why we don't use RPM to calculate stability. It's much more complicated than that. As Mark pointed out, air density has a lot to do with it. Air density has many more times an effect than RPM alone. I have personally fired gs177 30 cal bullets at sea level in 20 degree air in an 11x barrel with dramatic keyholes at 100 yards where at 5000' and 60 degrees they shoot just fine. All those findings are spot on with the miller formula. I also played with the 208 Amax in a 12x barrel/308 velocities comparing with the miller formula and again found it spot on. Every where it said it should be at 1.0 or greater drilled perfect holes. When it predicted <1.0, the were keyholing. I was testing this in various temps with a combo that is marginal to gain an accurate picture as to how accurate the miller formula is. It seems as if it is dead on. These examples are an area where higher velocity can help but it's the difference between a .95 stability factor to a 1.0 factor. It'll never take it from .8 to 1.5. IMHO, 1.5 is the best balance where you maximize your BC and ensure stability over a broad range of conditions. Too little and it can take longer for the yaw to settle down, too much and the nose doesn't want to follow the line of trajectory. Both negatively affect BC to some degree or another. Maybe not a ton, but every little bit adds up.</p></blockquote><p></p>
[QUOTE="Michael Eichele, post: 891380, member: 1007"] You all have illustrated exactly why we don't use RPM to calculate stability. It's much more complicated than that. As Mark pointed out, air density has a lot to do with it. Air density has many more times an effect than RPM alone. I have personally fired gs177 30 cal bullets at sea level in 20 degree air in an 11x barrel with dramatic keyholes at 100 yards where at 5000' and 60 degrees they shoot just fine. All those findings are spot on with the miller formula. I also played with the 208 Amax in a 12x barrel/308 velocities comparing with the miller formula and again found it spot on. Every where it said it should be at 1.0 or greater drilled perfect holes. When it predicted <1.0, the were keyholing. I was testing this in various temps with a combo that is marginal to gain an accurate picture as to how accurate the miller formula is. It seems as if it is dead on. These examples are an area where higher velocity can help but it's the difference between a .95 stability factor to a 1.0 factor. It'll never take it from .8 to 1.5. IMHO, 1.5 is the best balance where you maximize your BC and ensure stability over a broad range of conditions. Too little and it can take longer for the yaw to settle down, too much and the nose doesn't want to follow the line of trajectory. Both negatively affect BC to some degree or another. Maybe not a ton, but every little bit adds up. [/QUOTE]
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Nosler long range accbond and my experience.
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