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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
JBM ballistics drop table ???
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<blockquote data-quote="Pro2A" data-source="post: 1938892" data-attributes="member: 17889"><p>Au contriere, BC.....the propensity to retain velocity.............is pertinent all the way from the end of the barrel to impact. However, BC varies continuously with velocity. Most BCs are listed as a single value, typically selected from the drag curve by manufacturers at the highest value for Marketing bragging rights and consumer confusion and duping. Using a CDC (Custom Drag Curve) can provide much more accurate ballistic data. You shared....this was my expectations; this is what I observed.......two numbers. With no more info than provided, it's almost impossible to answer your question. Every answer, including mine, is a SWAG (Silly Wild </p><p>*** Guess). Was this observed deviation only for one group or was it verified repeatedly? You only mentioned vertical deviation. What was horizontal data? At 100 yds, it is mostly the rifle characteristics, ammo ES/SD, and shooter technique causing variation. As distance grows, environmental variables and bullet flight characteristics enter. Don't assume that a digital readout of a chrono is true. What chrono? Verified setup, accuracy of chrono? One shot or a statistically valid set? What are the ES and SD for the ammo? First, triple check all the input values to your ballistic program, including unit consistency. That's where deviations often begin. Do you have some variables turned off in the ballistic program? The bullet doesn't disregard any variable. What is the verified rifle performance envelope...0.25 or 1.5MOA? Right there is an expected 0.75 to 4.5"probable envelope at 300yds. What was your accuracy and precision at 100 yd zero? A perfect one hole 10-shot group....or 1"...aw, that's good enough. Scope tracking....is it a knocked around old Tasco or a verified precise tracking TT/SB/NF?? The shooter is usually the biggest variable.......recoil management, trigger technique, parallax adjustment, cant, and on, and on, and on. What is your experience? How much have you shot?.....beyond 100yds? Each variable contributes a an increment to the total deviation observed. Establish a reliable base at 100 yds. Then, begin pushing out inconsistencies. That's what makes shooting so interesting. Every trigger squeeze has a different set of variables. Always trust the bullet. The bullet always knows. The bullet never lies. But, it's all those sneaky variables the bullet pals around with ya gotta watch. As Dad always warned, show me your pals and I'll show you where you'll end up. Same with the bullet. The bullet is truth, but Consistency is King,</p></blockquote><p></p>
[QUOTE="Pro2A, post: 1938892, member: 17889"] Au contriere, BC.....the propensity to retain velocity.............is pertinent all the way from the end of the barrel to impact. However, BC varies continuously with velocity. Most BCs are listed as a single value, typically selected from the drag curve by manufacturers at the highest value for Marketing bragging rights and consumer confusion and duping. Using a CDC (Custom Drag Curve) can provide much more accurate ballistic data. You shared....this was my expectations; this is what I observed.......two numbers. With no more info than provided, it's almost impossible to answer your question. Every answer, including mine, is a SWAG (Silly Wild *** Guess). Was this observed deviation only for one group or was it verified repeatedly? You only mentioned vertical deviation. What was horizontal data? At 100 yds, it is mostly the rifle characteristics, ammo ES/SD, and shooter technique causing variation. As distance grows, environmental variables and bullet flight characteristics enter. Don't assume that a digital readout of a chrono is true. What chrono? Verified setup, accuracy of chrono? One shot or a statistically valid set? What are the ES and SD for the ammo? First, triple check all the input values to your ballistic program, including unit consistency. That's where deviations often begin. Do you have some variables turned off in the ballistic program? The bullet doesn't disregard any variable. What is the verified rifle performance envelope...0.25 or 1.5MOA? Right there is an expected 0.75 to 4.5"probable envelope at 300yds. What was your accuracy and precision at 100 yd zero? A perfect one hole 10-shot group....or 1"...aw, that's good enough. Scope tracking....is it a knocked around old Tasco or a verified precise tracking TT/SB/NF?? The shooter is usually the biggest variable.......recoil management, trigger technique, parallax adjustment, cant, and on, and on, and on. What is your experience? How much have you shot?.....beyond 100yds? Each variable contributes a an increment to the total deviation observed. Establish a reliable base at 100 yds. Then, begin pushing out inconsistencies. That's what makes shooting so interesting. Every trigger squeeze has a different set of variables. Always trust the bullet. The bullet always knows. The bullet never lies. But, it's all those sneaky variables the bullet pals around with ya gotta watch. As Dad always warned, show me your pals and I'll show you where you'll end up. Same with the bullet. The bullet is truth, but Consistency is King, [/QUOTE]
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