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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Need some ballistics help...
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<blockquote data-quote="novaman64" data-source="post: 1134681" data-attributes="member: 16158"><p>So have a new custom 280ai. Gunsmith worked up a load, and he was having fun with my rifle so took it out to 600, 800 and 1000 yards. That being said rifle is shooting Berger 168 VLD Hunting bullets, over 60.0 gr of H4831SC, and a mag primer (sight height of 1.75"). He said he chrono'd it at 3040, zero'd at 100 yards, and was shooting at 4800ft elevation, baro pressure was 24.8Hg. Anyways, he said at 600 yards drop was 9.5 moa, at 800 yards drop was 15.0 and at 1000 yards drop was 21.2 moa.</p><p></p><p>Plugged all the numbers into a few different ballistic apps (shooter and ballistic ae on my iphone) and the berger online ballistic app. Got data that matched his numbers...</p><p></p><p>Last weekend I went out to the range, temp was 67 deg, altitude was 245 ft, baro pressure was 29.894 Hg, plugged everything in, went out to 200 and shot 3 rounds. Calcs said should be 1.2 moa, dialed, and hit 1" high.</p><p>Went out to 300, calc said 3.0 moa, dialed it and hit 1.5 inches low.</p><p>400 yards calc said should be 5.2 moa, dialed it and hit 2.25 inches low.</p><p>And at 1000 yards said to dial 23.5 moa, shot that, and it had me 20 inches low.</p><p></p><p>Where am I going wrong?</p></blockquote><p></p>
[QUOTE="novaman64, post: 1134681, member: 16158"] So have a new custom 280ai. Gunsmith worked up a load, and he was having fun with my rifle so took it out to 600, 800 and 1000 yards. That being said rifle is shooting Berger 168 VLD Hunting bullets, over 60.0 gr of H4831SC, and a mag primer (sight height of 1.75"). He said he chrono'd it at 3040, zero'd at 100 yards, and was shooting at 4800ft elevation, baro pressure was 24.8Hg. Anyways, he said at 600 yards drop was 9.5 moa, at 800 yards drop was 15.0 and at 1000 yards drop was 21.2 moa. Plugged all the numbers into a few different ballistic apps (shooter and ballistic ae on my iphone) and the berger online ballistic app. Got data that matched his numbers... Last weekend I went out to the range, temp was 67 deg, altitude was 245 ft, baro pressure was 29.894 Hg, plugged everything in, went out to 200 and shot 3 rounds. Calcs said should be 1.2 moa, dialed, and hit 1" high. Went out to 300, calc said 3.0 moa, dialed it and hit 1.5 inches low. 400 yards calc said should be 5.2 moa, dialed it and hit 2.25 inches low. And at 1000 yards said to dial 23.5 moa, shot that, and it had me 20 inches low. Where am I going wrong? [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Need some ballistics help...
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