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Thoughts on BC
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<blockquote data-quote="Mysticplayer" data-source="post: 5047" data-attributes="member: 8947"><p>Bandit,</p><p></p><p>A very interesting and colourful descriptions of what many here know. The BC is simply a number based on the conditions you put into the computer. It is not fixed like mass or vel.</p><p></p><p>The BC of a bullet will change due to atmospheric conditions, muzzle vel, and even twist rate. One thing you didn't include was that different barrels launching the "same" bullet at the same vel may not have the same BC. This is due to the damage done to the bullet surface by the rifling.</p><p></p><p>You will hear no argument from me or from others that do alot of LR shooting that any load must be fully field tested. Drop tables must be confirmed by actual shooting and as much shooting must be done in different conditions to ensure dependable performance. Not to mention some practise for the shooter.</p><p></p><p>That is why I use the first shot sighter method for really LR shooting. In one instant, you eliminate all the variables and get a result (bullet impact) that represents the environment that you are in now. Real world, real time performance.</p><p></p><p>Run this one through a ballistic program and see what type of BC number you get. 165gr 30 cal bullet leaving at 2700fps needs 28 min. of adjustment from a 100yd zero to hit at 1000yds. That is what my '06 needs with SST bullets. With Interlock 165gr BTSP and the same load/rifle, it needs 44 min to do the same thing.</p><p></p><p>Doesn't make much sense does it? That drop has been verified several times.</p><p></p><p>Jerry</p></blockquote><p></p>
[QUOTE="Mysticplayer, post: 5047, member: 8947"] Bandit, A very interesting and colourful descriptions of what many here know. The BC is simply a number based on the conditions you put into the computer. It is not fixed like mass or vel. The BC of a bullet will change due to atmospheric conditions, muzzle vel, and even twist rate. One thing you didn't include was that different barrels launching the "same" bullet at the same vel may not have the same BC. This is due to the damage done to the bullet surface by the rifling. You will hear no argument from me or from others that do alot of LR shooting that any load must be fully field tested. Drop tables must be confirmed by actual shooting and as much shooting must be done in different conditions to ensure dependable performance. Not to mention some practise for the shooter. That is why I use the first shot sighter method for really LR shooting. In one instant, you eliminate all the variables and get a result (bullet impact) that represents the environment that you are in now. Real world, real time performance. Run this one through a ballistic program and see what type of BC number you get. 165gr 30 cal bullet leaving at 2700fps needs 28 min. of adjustment from a 100yd zero to hit at 1000yds. That is what my '06 needs with SST bullets. With Interlock 165gr BTSP and the same load/rifle, it needs 44 min to do the same thing. Doesn't make much sense does it? That drop has been verified several times. Jerry [/QUOTE]
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