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Long Range Hunting & Shooting
Anybody calculated AccuBond B.C?
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<blockquote data-quote="Thor" data-source="post: 170093" data-attributes="member: 6396"><p>Meichele,</p><p></p><p>Thanks for explaining that for me. Yeah, I was thinking you were having wide variations from the same load. </p><p></p><p>Too bad I'm not shooting a .308 M118 match round, all the homework's been done on that one. Here's my question to the backyard scientists out there.</p><p></p><p>Any .30 Accubond 180 gr bullet should have the same ballistic coeficient (B.C.) regardless of what .30 caliber gun (i.e 300 RUM, .300 WM, or .30-06) since the B.C is a measure of the bullet's efficiency in flight - compared to the model's 'standard' projectile. Same theory applies to another caliber bullet as well. Right?</p><p></p><p>Wouldn't the same bullet in a certain caliber have the same B.C since ballistic coefficient is a measure of it's efficiency in flight (drag through the air)?</p><p></p><p>Now I'm definitely not a scientist but I was told there are multiple 'G' models (G1,G3,G7) and that they are not interchangable but I thought all manufacturers used the same G1 model to compare 'apples to apples'. BTW- I don't know jack about the individual differences between each G model.</p><p></p><p>Somebody asked how you would determine the bullet B.C. Here's what I'd do:</p><p></p><p>1. Fire your pet load on a certain day, note muzzle velocity, air temp, barometric pressure.</p><p>2. Determine your 'come ups' for different ranges. </p><p>3. Plug the velocity and weather and altitude into your software along with bullet B.C. Compare the drop data calculations to your actual field results.</p><p>4. If they dont exactly match at the all ranges then change your bullet B.C. value up or down until the software calculations match field data.</p><p>5. Write down the numbers you used.</p><p></p><p>You should now be able to pull up drop data for any hunting condition you need anywhere in the world.</p><p></p><p>This is why I was curious what guys had for the true BC. I'll post what I find after I shoot them but it should be after the guns are done.</p></blockquote><p></p>
[QUOTE="Thor, post: 170093, member: 6396"] Meichele, Thanks for explaining that for me. Yeah, I was thinking you were having wide variations from the same load. Too bad I'm not shooting a .308 M118 match round, all the homework's been done on that one. Here's my question to the backyard scientists out there. Any .30 Accubond 180 gr bullet should have the same ballistic coeficient (B.C.) regardless of what .30 caliber gun (i.e 300 RUM, .300 WM, or .30-06) since the B.C is a measure of the bullet's efficiency in flight - compared to the model's 'standard' projectile. Same theory applies to another caliber bullet as well. Right? Wouldn't the same bullet in a certain caliber have the same B.C since ballistic coefficient is a measure of it's efficiency in flight (drag through the air)? Now I'm definitely not a scientist but I was told there are multiple 'G' models (G1,G3,G7) and that they are not interchangable but I thought all manufacturers used the same G1 model to compare 'apples to apples'. BTW- I don't know jack about the individual differences between each G model. Somebody asked how you would determine the bullet B.C. Here's what I'd do: 1. Fire your pet load on a certain day, note muzzle velocity, air temp, barometric pressure. 2. Determine your 'come ups' for different ranges. 3. Plug the velocity and weather and altitude into your software along with bullet B.C. Compare the drop data calculations to your actual field results. 4. If they dont exactly match at the all ranges then change your bullet B.C. value up or down until the software calculations match field data. 5. Write down the numbers you used. You should now be able to pull up drop data for any hunting condition you need anywhere in the world. This is why I was curious what guys had for the true BC. I'll post what I find after I shoot them but it should be after the guns are done. [/QUOTE]
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Anybody calculated AccuBond B.C?
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