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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Need help figuring out discrepancies
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<blockquote data-quote="SBruce" data-source="post: 706665" data-attributes="member: 21068"><p>My first thoughts would be velocity.......are you all <u>sure</u> you're getting 3050-3075'/sec.?? BC doesn't make that much difference at 550.</p><p> </p><p>2nd consideration would be shooting conditions, mirage ect. I've personally seen (more than once) up to 1 moa variance based on a combination of shooting rest, sun angle and mirage. I've see nearly 1 MOA at 300 and also seen it at 1000. Went back to original conditions a few days later and had predictable results. Not saying this is the case in their case, but it does happen. Seen >1/2 MOA vertical at 300 yds just off ground mirage alone!!</p><p> </p><p>My program says you'd have to be around 2750'/sec. to need 9.25 MOA at 550.</p><p> </p><p>3rd consideration would be scope click values. <u>Have they done the click tests.?</u></p><p>IME most scopes dont actually move the POI the advertised amount, and that makes a huge difference when dialing corrections.</p><p> </p><p>If they had more ammo, I'd say shoot again through the chono and shoot again at 200, 400, and 500/550. Also shoot a click test. Do this under favorable conditions and make the print out match your real world results.</p></blockquote><p></p>
[QUOTE="SBruce, post: 706665, member: 21068"] My first thoughts would be velocity.......are you all [U]sure[/U] you're getting 3050-3075'/sec.?? BC doesn't make that much difference at 550. 2nd consideration would be shooting conditions, mirage ect. I've personally seen (more than once) up to 1 moa variance based on a combination of shooting rest, sun angle and mirage. I've see nearly 1 MOA at 300 and also seen it at 1000. Went back to original conditions a few days later and had predictable results. Not saying this is the case in their case, but it does happen. Seen >1/2 MOA vertical at 300 yds just off ground mirage alone!! My program says you'd have to be around 2750'/sec. to need 9.25 MOA at 550. 3rd consideration would be scope click values. [U]Have they done the click tests.?[/U] IME most scopes dont actually move the POI the advertised amount, and that makes a huge difference when dialing corrections. If they had more ammo, I'd say shoot again through the chono and shoot again at 200, 400, and 500/550. Also shoot a click test. Do this under favorable conditions and make the print out match your real world results. [/QUOTE]
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Need help figuring out discrepancies
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