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Hunting
Long Range Hunting & Shooting
Re-zeroing at altitude
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<blockquote data-quote="GreenDecoy" data-source="post: 1721818" data-attributes="member: 109506"><p>You don't have to zero your rifle at 100 to know what your 100 yard zero is at a given altitude. Using 100 yards is convenient for the ballistic apps. </p><p></p><p>But say I zero at 300 yards at sea level. The zero may be off a little at 10k'. But you can adjust it using AB or any app based on altitude. You can also determine your hundred yard zero quite easily too. </p><p></p><p>I always sight in at 100 and then dial up dope for MPBR at altitude. My dope chart tells me how much I need to dial down to reset my 100 yd zero. </p><p></p><p>It looks like about a 3" difference for most cartridges at 500 yds going between sea level and 10000. Temperature has major impact too because air density is all that matters for drag. The density altitude on a hot muggy day at sea level could be over 3000'. So the difference between a cold mountain day at 10k' and the firing line outside Atlanta in July may be less than you might think.</p></blockquote><p></p>
[QUOTE="GreenDecoy, post: 1721818, member: 109506"] You don’t have to zero your rifle at 100 to know what your 100 yard zero is at a given altitude. Using 100 yards is convenient for the ballistic apps. But say I zero at 300 yards at sea level. The zero may be off a little at 10k’. But you can adjust it using AB or any app based on altitude. You can also determine your hundred yard zero quite easily too. I always sight in at 100 and then dial up dope for MPBR at altitude. My dope chart tells me how much I need to dial down to reset my 100 yd zero. It looks like about a 3” difference for most cartridges at 500 yds going between sea level and 10000. Temperature has major impact too because air density is all that matters for drag. The density altitude on a hot muggy day at sea level could be over 3000’. So the difference between a cold mountain day at 10k’ and the firing line outside Atlanta in July may be less than you might think. [/QUOTE]
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Re-zeroing at altitude
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