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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Thoughts on minimum BC
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<blockquote data-quote="BallisticsGuy" data-source="post: 1509454" data-attributes="member: 96226"><p>Different people have different definitions of ELR which will pollute the discussion a bit. Velocities in common modern high power rifles ranging from <2400->3400fps also pollutes the possible answer set with if's and but's. We can clean up the discussion by limiting our conversation to a parameterized set of values and things clear up a little.</p><p></p><p>There's a relatively narrow window of common velocities that one might expect from a modern high power rifle that's going to be used for long range work. If you focus on the slow side of that then the question is easier to answer in an apples-to-apples way. I'm using 2400fps for this example: BC's under .450 G1 makes for limiting supersonic range to a good bit under 1000yrds, not much more than 800 actually. At .500 G1 you're just getting 1000yrds supersonic. By .550 G1 you're out to around 1100yrds. By .600 G1 you're dealing with a bullet that will get to around 1200yrds supersonic. At .650 G1 you're around 1300yrds. Additional velocity extends those range numbers. Velocity comes at the cost of powder, barrel wear, recoil and blast. This is why the 6.5CM is so lauded. Modest velocities and the pretty high BC #'s common to mid-to-heavy weight 6.5mm bullets makes for a ton of supersonic range with a very tolerable cost in powder appetite, barrel wear, recoil and blast. </p><p></p><p>BC is the thing that allows you to get out as far as you want without having to run the bullet so fast as you otherwise would. Don't get hung up over .005 difference on a BC of one bullet versus another.</p></blockquote><p></p>
[QUOTE="BallisticsGuy, post: 1509454, member: 96226"] Different people have different definitions of ELR which will pollute the discussion a bit. Velocities in common modern high power rifles ranging from <2400->3400fps also pollutes the possible answer set with if's and but's. We can clean up the discussion by limiting our conversation to a parameterized set of values and things clear up a little. There's a relatively narrow window of common velocities that one might expect from a modern high power rifle that's going to be used for long range work. If you focus on the slow side of that then the question is easier to answer in an apples-to-apples way. I'm using 2400fps for this example: BC's under .450 G1 makes for limiting supersonic range to a good bit under 1000yrds, not much more than 800 actually. At .500 G1 you're just getting 1000yrds supersonic. By .550 G1 you're out to around 1100yrds. By .600 G1 you're dealing with a bullet that will get to around 1200yrds supersonic. At .650 G1 you're around 1300yrds. Additional velocity extends those range numbers. Velocity comes at the cost of powder, barrel wear, recoil and blast. This is why the 6.5CM is so lauded. Modest velocities and the pretty high BC #'s common to mid-to-heavy weight 6.5mm bullets makes for a ton of supersonic range with a very tolerable cost in powder appetite, barrel wear, recoil and blast. BC is the thing that allows you to get out as far as you want without having to run the bullet so fast as you otherwise would. Don't get hung up over .005 difference on a BC of one bullet versus another. [/QUOTE]
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Thoughts on minimum BC
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