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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="Michael Eichele" data-source="post: 475924" data-attributes="member: 1007"><p>The questions I have lay with the fact that I have been using the same physical chronies for several years. We have alot of cloudy days here. I do all of my serious and documented testing with cloud cover for consistency.</p><p></p><p>The reason so many inconsistencies baffle me is due to the fact that I do the same thing using the same chronies and often times the same scope transfered from one rifle to the next in similar lighting for each rifle and load. In some cases, using the same rifle/scope/bullet with a new barrel. I will say that when the velocity and twist is similar, the BC is similar from barrel to barrel. When there is a major barrel and/or velocity difference, I see much bigger changes in the BC. I say BC because changing only the barrel and velocity changes my predicted drops so that the BC value is the only variable that has to change to make my drops work. Aside from using a new velocity in the calculator.</p><p></p><p>Calibrated, Yes. In addition, in many tests, even between different rifles, the same physical scope was used. Same rings, using picatinny rails on each rifle and re-sighted.</p></blockquote><p></p>
[QUOTE="Michael Eichele, post: 475924, member: 1007"] The questions I have lay with the fact that I have been using the same physical chronies for several years. We have alot of cloudy days here. I do all of my serious and documented testing with cloud cover for consistency. The reason so many inconsistencies baffle me is due to the fact that I do the same thing using the same chronies and often times the same scope transfered from one rifle to the next in similar lighting for each rifle and load. In some cases, using the same rifle/scope/bullet with a new barrel. I will say that when the velocity and twist is similar, the BC is similar from barrel to barrel. When there is a major barrel and/or velocity difference, I see much bigger changes in the BC. I say BC because changing only the barrel and velocity changes my predicted drops so that the BC value is the only variable that has to change to make my drops work. Aside from using a new velocity in the calculator. Calibrated, Yes. In addition, in many tests, even between different rifles, the same physical scope was used. Same rings, using picatinny rails on each rifle and re-sighted. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Let's argue about BC's
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