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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Quest for g7 ballistics programs (can we please make a list)
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<blockquote data-quote="NZ Longranger" data-source="post: 306496" data-attributes="member: 14"><p>The problem with the Pejsa system is you have to do extensive downrange testing to establish the retardation coefficient and break velocity to get it to match your actual trajectory. Yes, once you've done that, it will get pretty close out to transonic velocities. </p><p>The only system that I've found so far that can be used from the get-go with a single input is the G7 BC. It is also the only one that can be used for comparisons between bullets, as with Pejsa, you have these 2 other factors plus the G1 BC that have to be fudged that make comparisons inaccurate.</p><p>An averaged G1 works ok to about 2000 fps or around 1000 yards with fast VLD's, a best guess Pejsa will work to a bit further, but beyond that you need to adjust with multiple BC's for G1, or retardation coefficients and break velocities for pejsa - both from actual shooting tests to have any success.</p><p>G7 is it - at this stage anyway!</p><p>Greg</p></blockquote><p></p>
[QUOTE="NZ Longranger, post: 306496, member: 14"] The problem with the Pejsa system is you have to do extensive downrange testing to establish the retardation coefficient and break velocity to get it to match your actual trajectory. Yes, once you've done that, it will get pretty close out to transonic velocities. The only system that I've found so far that can be used from the get-go with a single input is the G7 BC. It is also the only one that can be used for comparisons between bullets, as with Pejsa, you have these 2 other factors plus the G1 BC that have to be fudged that make comparisons inaccurate. An averaged G1 works ok to about 2000 fps or around 1000 yards with fast VLD's, a best guess Pejsa will work to a bit further, but beyond that you need to adjust with multiple BC's for G1, or retardation coefficients and break velocities for pejsa - both from actual shooting tests to have any success. G7 is it - at this stage anyway! Greg [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Quest for g7 ballistics programs (can we please make a list)
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