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Long Range Hunting & Shooting
Help calculating a BC from two speeds
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<blockquote data-quote="aroshtr" data-source="post: 167782" data-attributes="member: 9176"><p><span style="color: #191970">OK, I guess I can't get it figured out on my own. I have good data, but can't seem to figure out how to apply it to get consistant results. I am working with a new bullet (Wildcat ULD RBBT .277cal 150grn) and get a variety of results on a calculated B.C. From the data below I have values ranging from .516 to .590 (I think these are all G1 drag models) depending on what program I use, and what "atmospheric" boxes I check. If someone who understands the weather stuff better than me could help me out I would greatly appreciate it. Here is the data.</span></p><p><span style="color: #191970"></span></p><p><span style="color: #191970">Chronograph was placed at 10ft & 198 yards (195 yards apart)</span></p><p><span style="color: #191970">Initial speed average 3095fps.</span></p><p><span style="color: #191970">End speed average 2775fps.</span></p><p><span style="color: #191970">It was 60-61 degrees, 33% relative humidity, elevation was 3680ft.</span></p><p><span style="color: #191970">Noaa reported the barometer at 29.85 or 1011.3mb. The station is at 3398ft elevation.</span></p></blockquote><p></p>
[QUOTE="aroshtr, post: 167782, member: 9176"] [COLOR=#191970]OK, I guess I can't get it figured out on my own. I have good data, but can't seem to figure out how to apply it to get consistant results. I am working with a new bullet (Wildcat ULD RBBT .277cal 150grn) and get a variety of results on a calculated B.C. From the data below I have values ranging from .516 to .590 (I think these are all G1 drag models) depending on what program I use, and what "atmospheric" boxes I check. If someone who understands the weather stuff better than me could help me out I would greatly appreciate it. Here is the data.[/COLOR] [COLOR=#191970] Chronograph was placed at 10ft & 198 yards (195 yards apart) Initial speed average 3095fps. End speed average 2775fps. It was 60-61 degrees, 33% relative humidity, elevation was 3680ft. Noaa reported the barometer at 29.85 or 1011.3mb. The station is at 3398ft elevation.[/COLOR] [/QUOTE]
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Help calculating a BC from two speeds
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