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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Let's argue about BC's
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<blockquote data-quote="eddybo" data-source="post: 474982" data-attributes="member: 7194"><p>I dunno. I have used published BCs for several different bullets to shoot out to 1 mile. One bullet in particular, If I use BLs given BC I would hit nothing but air. If I use my "derived" BC I am very close. I dunno what the BC of the bullet is all I know is what I can plug in exbal and hit stuff. </p><p> </p><p>With say a 7mm a-max at 300, 500, 800, 1200, 1400, and 1760 using the advertised BC I am pretty close with some slight anomalys which I can usually correct with a modification to the primary and secondary BC. </p><p>For one bullet I plug in my derived BC and it works just about as well as the advertised BC for other bullets.....I plug in Bryan's BC for that same bullet not even close. </p><p> </p><p>Who is wrong I dunno, do not care anymore, and will admit that the error is probably with me. I wasted close to 70 rounds of barrel life of my 338AM trying to find what the problem is. I finally threw my hands in the air, plugged in the number that works and have not looked back. If I start a new profile in exbal for this bullet using the same exact data except for BLs BC and my "derived" BC there is a substantial difference.</p><p> </p><p>There is one simple explanation why it could be that most advertised BCs work and my "inflated" "derived" BC also work. That explanation would be that all advertised BCs are grossly over inflated. Maybe they are grossly inflated so they will actually work?</p><p> </p><p>I cannot recal the exact numbers Kirby was using to shoot stuff way out there with the 7mm AM, but am pretty sure that it is higher than BLs BC of the bullet. I think if I had one shot at a target at 1400 yards and the opportunity to use either whatever BC Kirby was using, or the new corrected BC for the 7mm 200gr wildcat , I would not have a problem choosing which I would use.</p><p>I have decided that BCs do not matter and are irrelevant. The only way to get it right is to shoot the rifle at multiple yardages further than you will ever shoot at an animal and creat a BC. Take no shortcuts,and have no problems.</p></blockquote><p></p>
[QUOTE="eddybo, post: 474982, member: 7194"] I dunno. I have used published BCs for several different bullets to shoot out to 1 mile. One bullet in particular, If I use BLs given BC I would hit nothing but air. If I use my "derived" BC I am very close. I dunno what the BC of the bullet is all I know is what I can plug in exbal and hit stuff. With say a 7mm a-max at 300, 500, 800, 1200, 1400, and 1760 using the advertised BC I am pretty close with some slight anomalys which I can usually correct with a modification to the primary and secondary BC. For one bullet I plug in my derived BC and it works just about as well as the advertised BC for other bullets.....I plug in Bryan's BC for that same bullet not even close. Who is wrong I dunno, do not care anymore, and will admit that the error is probably with me. I wasted close to 70 rounds of barrel life of my 338AM trying to find what the problem is. I finally threw my hands in the air, plugged in the number that works and have not looked back. If I start a new profile in exbal for this bullet using the same exact data except for BLs BC and my "derived" BC there is a substantial difference. There is one simple explanation why it could be that most advertised BCs work and my "inflated" "derived" BC also work. That explanation would be that all advertised BCs are grossly over inflated. Maybe they are grossly inflated so they will actually work? I cannot recal the exact numbers Kirby was using to shoot stuff way out there with the 7mm AM, but am pretty sure that it is higher than BLs BC of the bullet. I think if I had one shot at a target at 1400 yards and the opportunity to use either whatever BC Kirby was using, or the new corrected BC for the 7mm 200gr wildcat , I would not have a problem choosing which I would use. I have decided that BCs do not matter and are irrelevant. The only way to get it right is to shoot the rifle at multiple yardages further than you will ever shoot at an animal and creat a BC. Take no shortcuts,and have no problems. [/QUOTE]
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