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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
280 AI Ballistics: I need help, I am Confused
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<blockquote data-quote="AaronSkipDavidson" data-source="post: 1875030" data-attributes="member: 6373"><p>I agree with most of the previous suggestions. The Oehler chrono is most likely correct. Its never a sure thing with a chronograph. Can you find a Labradar or Magneto speed to check against? That would be step one. Step two, bypass the tall target test and just manipulate the BC. Unless you are trying to shoot WAY out there, this approach will be sufficient. Many variables affect the BC that your individual gun will shoot. For example, I had 2 different 7mms I was shooting a couple of years ago. One had an 8.75 twist and the other an 8.0, the effective BC difference from the same lot of ammo using Hornady 180 gr ELDm bullets was .355 vs .410! This was based on shooting data out to 1600 yards on multiple sessions. Good luck!</p></blockquote><p></p>
[QUOTE="AaronSkipDavidson, post: 1875030, member: 6373"] I agree with most of the previous suggestions. The Oehler chrono is most likely correct. Its never a sure thing with a chronograph. Can you find a Labradar or Magneto speed to check against? That would be step one. Step two, bypass the tall target test and just manipulate the BC. Unless you are trying to shoot WAY out there, this approach will be sufficient. Many variables affect the BC that your individual gun will shoot. For example, I had 2 different 7mms I was shooting a couple of years ago. One had an 8.75 twist and the other an 8.0, the effective BC difference from the same lot of ammo using Hornady 180 gr ELDm bullets was .355 vs .410! This was based on shooting data out to 1600 yards on multiple sessions. Good luck! [/QUOTE]
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280 AI Ballistics: I need help, I am Confused
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