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<blockquote data-quote="Michael Eichele" data-source="post: 272264" data-attributes="member: 1007"><p>This is a very complicated subject. More than most would realize. The truth is that Barnes and Berger have BC's based on tests done in their labs using their equipment just like ANY other bullet manufacture. Most manufacturers published BC's are close enough to get you on paper at LR but not neccesarily in the X ring.</p><p></p><p>This is where it gets complicated. The reason you cannot get the same results as the manufactures is because youre not using their rifles. Your not using their loads. MANY factors go into a real BC and they will be different from rifle to rifle.</p><p></p><p>Some factors but not limited to are:</p><p></p><p>Bore quality, stability factor (which is related to the twist rate AND velocity AND bullet demensions), twist rate, groove number, velocity, bullet design, bullet construction, bullet runout, bullet defects and more. I didnt mention air density because after we find our true BC in the real world with our equipment, this number becomes a baseline or mathematical constant for our calculations. The BC will change from day to day in different air but the number we use to get accurate ballistics stays constant.</p><p></p><p>It is impossible to have a website that lists the true BC of any bullet.</p><p></p><p>Clear as mud right?</p></blockquote><p></p>
[QUOTE="Michael Eichele, post: 272264, member: 1007"] This is a very complicated subject. More than most would realize. The truth is that Barnes and Berger have BC's based on tests done in their labs using their equipment just like ANY other bullet manufacture. Most manufacturers published BC's are close enough to get you on paper at LR but not neccesarily in the X ring. This is where it gets complicated. The reason you cannot get the same results as the manufactures is because youre not using their rifles. Your not using their loads. MANY factors go into a real BC and they will be different from rifle to rifle. Some factors but not limited to are: Bore quality, stability factor (which is related to the twist rate AND velocity AND bullet demensions), twist rate, groove number, velocity, bullet design, bullet construction, bullet runout, bullet defects and more. I didnt mention air density because after we find our true BC in the real world with our equipment, this number becomes a baseline or mathematical constant for our calculations. The BC will change from day to day in different air but the number we use to get accurate ballistics stays constant. It is impossible to have a website that lists the true BC of any bullet. Clear as mud right? [/QUOTE]
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