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Long Range Hunting & Shooting
need help on the leica 1600b
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<blockquote data-quote="Timber338" data-source="post: 1058403" data-attributes="member: 33822"><p>The only way that reading would be an accurate distance to plug in to your ballistic app is if absolute pressure was 29.92 and the temp was 68`F.</p><p></p><p>Let's look at it this way (I'm just guessing at the numbers to get my point across)</p><p></p><p>You're out hunting elk and you're at 8700 ft elevation. It's opening morning and you range a nice bull on the far side of a canyon up on a tall ridge and you've got your 1600b configured just like you've got it now. The reading says 798 yards and then flashes EFr distance of 712 yards.</p><p></p><p>You take 712 yards plug it into your shooter app and you also input 21.8 inHg for the absolute pressure and 27`F for the temperature.</p><p></p><p>You are going to miss that elk.</p><p></p><p>The reason is that the 1600b has already accounted for the 21.8 inHg pressure difference (compared to the pre-set 29.92 inHg) and the 41 degree temp difference from the pre-set curve (68`F - 27`F =41`F) in order to calculate the 712 yard EFr. So you are double-counting the pressure and temp difference. The leica does it once and you do it again in your shooter app.</p><p></p><p>Does that make sense? Even though you don't care about the pre-set trajectory, the 1600b uses whatever pre-set curve you've got plugged in to generate the EHr distance it displays.</p></blockquote><p></p>
[QUOTE="Timber338, post: 1058403, member: 33822"] The only way that reading would be an accurate distance to plug in to your ballistic app is if absolute pressure was 29.92 and the temp was 68`F. Let's look at it this way (I'm just guessing at the numbers to get my point across) You're out hunting elk and you're at 8700 ft elevation. It's opening morning and you range a nice bull on the far side of a canyon up on a tall ridge and you've got your 1600b configured just like you've got it now. The reading says 798 yards and then flashes EFr distance of 712 yards. You take 712 yards plug it into your shooter app and you also input 21.8 inHg for the absolute pressure and 27`F for the temperature. You are going to miss that elk. The reason is that the 1600b has already accounted for the 21.8 inHg pressure difference (compared to the pre-set 29.92 inHg) and the 41 degree temp difference from the pre-set curve (68`F - 27`F =41`F) in order to calculate the 712 yard EFr. So you are double-counting the pressure and temp difference. The leica does it once and you do it again in your shooter app. Does that make sense? Even though you don't care about the pre-set trajectory, the 1600b uses whatever pre-set curve you've got plugged in to generate the EHr distance it displays. [/QUOTE]
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need help on the leica 1600b
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