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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
LoadBase 3.0 Mobile w/G7 BC Test Results
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<blockquote data-quote="BryanLitz" data-source="post: 382214" data-attributes="member: 7848"><p>The purpose of integrating a downrange chronograph is to be able to measure BC (obviously). There's an easier way to do this, with acoustic sensors.</p><p></p><p>Using a chrono and mic at the muzzle in conjunction with a mic downrange gives you enough information (MV and tof) to calculate BC. The advantage of this set-up is that you don't have to shoot thru a small window on the chrono because the range of the acoustic sensor (microphone) is tens of feet and is omni-directional. If you could add the sound that the downrange camera hears to the sound recorded by a mic placed with the muzzle chronograph, you can gather: </p><p>MV (useful in-and-of itself for testing purposes)</p><p>tof (used in conjunction with MV to get BC)</p><p>video (to see the group forming)</p><p></p><p>This is just about everything there is to be interested in for an external ballistics test.</p><p></p><p>The system I use to measure BC's uses a chrono at the muzzle and several mics along the range. This allows the calculation of a velocity dependent BC, and lets you identify which standard is a better match for a particular bullet (usually G7). The set-up is very much simplified if you only have one downrange mic to deal with. Sounds like you already have all the hardware required with the exception of a mic at the muzzle chronograph, it's just a matter of integration.</p><p></p><p>BTW (phorwath) glad to hear you got such good results with the G7 BC and the 7mm 168 VLD in your test with LoadBase. Question: did you have to monkey with the ****** coefficient at all, or did you leave it at the default value?</p><p></p><p>-Bryan</p></blockquote><p></p>
[QUOTE="BryanLitz, post: 382214, member: 7848"] The purpose of integrating a downrange chronograph is to be able to measure BC (obviously). There's an easier way to do this, with acoustic sensors. Using a chrono and mic at the muzzle in conjunction with a mic downrange gives you enough information (MV and tof) to calculate BC. The advantage of this set-up is that you don't have to shoot thru a small window on the chrono because the range of the acoustic sensor (microphone) is tens of feet and is omni-directional. If you could add the sound that the downrange camera hears to the sound recorded by a mic placed with the muzzle chronograph, you can gather: MV (useful in-and-of itself for testing purposes) tof (used in conjunction with MV to get BC) video (to see the group forming) This is just about everything there is to be interested in for an external ballistics test. The system I use to measure BC's uses a chrono at the muzzle and several mics along the range. This allows the calculation of a velocity dependent BC, and lets you identify which standard is a better match for a particular bullet (usually G7). The set-up is very much simplified if you only have one downrange mic to deal with. Sounds like you already have all the hardware required with the exception of a mic at the muzzle chronograph, it's just a matter of integration. BTW (phorwath) glad to hear you got such good results with the G7 BC and the 7mm 168 VLD in your test with LoadBase. Question: did you have to monkey with the ****** coefficient at all, or did you leave it at the default value? -Bryan [/QUOTE]
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LoadBase 3.0 Mobile w/G7 BC Test Results
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