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Gunwerks G7 BR2 Rangefinder Review
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<blockquote data-quote="woolecox" data-source="post: 1223375" data-attributes="member: 18551"><p>Well I have to respectfully disagree with you. Any moderately advanced ballistics program requires atmospheric data to be input at the time of Zero. Otherwise, the program has no starting point of reference other than a raw zero when corrections are applied in the field.</p><p></p><p>In my situation, the 60 degree temperature drop was enough to cause a 1.2" drop in zero at 100 yards on the mountain. Same for my two hunting partners. Effectively, our zero's were no longer valid. </p><p></p><p>Once we input our Zero atmosphere (fortunately, I had recorded the data) and the Shooter program uploaded current conditions, all was well. And it has been ever since, no matter the conditions. </p><p></p><p>I have used just about every ballistic program ever made. For the last several years, my hunting buddies and I have used Shooter. At the time of Zero, it is critical to enter your atmospherics as well as velocity, range, BC, etc. You can even enter spin drift and coriolis if you choose. Once you get to the place where you will hunt/shoot you can simply upload current conditions if you have a cell phone connection or upload the data manually.</p><p></p><p>With the G7, current conditions are uploaded automatically when you hit the range button. Very cool assuming the onboard weather station is accurate. <strong>And if you are using the BDC mode, you were allowed to enter your Zero Temp and Altitude as part of the program</strong>. That is a good start. However, using the MRAD or MOA programs, those two variables are not allowed. </p><p></p><p>Without the Zero atmospherics entered, the G7 would have been giving me a solution with a built in error of more than one MOA! That would be a 4" plus miss at 400 yards. <strong>If Altitude and Temperature were important Zero data for the BDC program, why was it not important for the MRAD and MOA programs?</strong> And what about Humidity, look angle, spin drift, zero offset, etc?</p></blockquote><p></p>
[QUOTE="woolecox, post: 1223375, member: 18551"] Well I have to respectfully disagree with you. Any moderately advanced ballistics program requires atmospheric data to be input at the time of Zero. Otherwise, the program has no starting point of reference other than a raw zero when corrections are applied in the field. In my situation, the 60 degree temperature drop was enough to cause a 1.2” drop in zero at 100 yards on the mountain. Same for my two hunting partners. Effectively, our zero’s were no longer valid. Once we input our Zero atmosphere (fortunately, I had recorded the data) and the Shooter program uploaded current conditions, all was well. And it has been ever since, no matter the conditions. I have used just about every ballistic program ever made. For the last several years, my hunting buddies and I have used Shooter. At the time of Zero, it is critical to enter your atmospherics as well as velocity, range, BC, etc. You can even enter spin drift and coriolis if you choose. Once you get to the place where you will hunt/shoot you can simply upload current conditions if you have a cell phone connection or upload the data manually. With the G7, current conditions are uploaded automatically when you hit the range button. Very cool assuming the onboard weather station is accurate. [B]And if you are using the BDC mode, you were allowed to enter your Zero Temp and Altitude as part of the program[/B]. That is a good start. However, using the MRAD or MOA programs, those two variables are not allowed. Without the Zero atmospherics entered, the G7 would have been giving me a solution with a built in error of more than one MOA! That would be a 4" plus miss at 400 yards. [B]If Altitude and Temperature were important Zero data for the BDC program, why was it not important for the MRAD and MOA programs?[/B] And what about Humidity, look angle, spin drift, zero offset, etc? [/QUOTE]
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