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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Hammer ballistic coefficient tests...
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<blockquote data-quote="RockyMtnMT" data-source="post: 2621053" data-attributes="member: 7999"><p>There was a day several years ago that we were shooting two 300 rums, basically twins, with the same load. We were shooting at 1000y on the same shooting session. One rifle needed 4 more moa correction than the other one did. My comment at the time was, What the $%^& do we do with this data? I wish it was easy to come up with accurate numbers. The fact is, it is not. We did purchase an Oehler 89 to do bc calculations. It has been difficult to find time to use it since our business has increased. We will be MAKING time, somehow in the near future. The problem is, it will accurately measure the bc of a bullet from that particular weapon on that particular day. Still making it clear as mud.</p><p></p><p>An accurate bc for a particular rifle and bullet combo on a particular day, will accurately predict how fast a bullet will slow down. I do not believe that bc value will accurately predict wind drift. Right now bc is the only value that we have to try and predict drift, because there is nothing else. bc is the drag that predicts linear trajectory, it does not predict forces other than that. It is an aid at best. We will go out on range sessions with several diff rifles and bullets and wind up holding nearly the same wind for all of them. This does not line up with the accurate bc that is calculated from the drops. I am pretty firm in the camp that a heavier bullet with the same bc as a lighter bullet will have less wind drift.</p><p></p><p>I'll conclude with this. If this stuff was easy, then this discussion would not even take place.</p></blockquote><p></p>
[QUOTE="RockyMtnMT, post: 2621053, member: 7999"] There was a day several years ago that we were shooting two 300 rums, basically twins, with the same load. We were shooting at 1000y on the same shooting session. One rifle needed 4 more moa correction than the other one did. My comment at the time was, What the $%^& do we do with this data? I wish it was easy to come up with accurate numbers. The fact is, it is not. We did purchase an Oehler 89 to do bc calculations. It has been difficult to find time to use it since our business has increased. We will be MAKING time, somehow in the near future. The problem is, it will accurately measure the bc of a bullet from that particular weapon on that particular day. Still making it clear as mud. An accurate bc for a particular rifle and bullet combo on a particular day, will accurately predict how fast a bullet will slow down. I do not believe that bc value will accurately predict wind drift. Right now bc is the only value that we have to try and predict drift, because there is nothing else. bc is the drag that predicts linear trajectory, it does not predict forces other than that. It is an aid at best. We will go out on range sessions with several diff rifles and bullets and wind up holding nearly the same wind for all of them. This does not line up with the accurate bc that is calculated from the drops. I am pretty firm in the camp that a heavier bullet with the same bc as a lighter bullet will have less wind drift. I'll conclude with this. If this stuff was easy, then this discussion would not even take place. [/QUOTE]
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Hammer ballistic coefficient tests...
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