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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
30 nolser velocity vs drop chart
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<blockquote data-quote="Tangent" data-source="post: 1666306" data-attributes="member: 110477"><p>I don't think there is enough information to say what the problem is. But, we can say that this is not solely a BC <u><em>or</em></u> MV issue. If we hold the velocity of 3,040 fps, and toggled BC to match drop at 1,600 yards using 3,200 fps (presumably with the factory BC of 0.348), the BC would need to be ~0.363. But this change in BC would not constitute a miss at 400 yards. For a MV of 3,140 fps, changing the BC from 0.348 to 0.363 accounts for 0.2-inches of difference at 400 yards compared to a MV of 3,140 fps with a BC of 0.348.</p><p></p><p>If the scope is adjusting in SMOA (IPHY), I would expect that he would be shooting low compared to TMOA. But the scope could be part of the problem as well.</p><p></p><p>To the OP, were you shooting paper or steel? If steel, did you go downrange to confirm hit location relative to center? Can you provide more specific information regarding real world drops and observed group sizes?</p><p></p><p>I would also double check the following:</p><ul> <li data-xf-list-type="ul">Check torque settings on action screws</li> <li data-xf-list-type="ul">Make sure scope is properly mounted & torqued to rifle, set for eye relief, diopter is set to you, and that you are adjusting parallax correctly.</li> <li data-xf-list-type="ul">I would run a tall target test on your scope to check for tracking</li> <li data-xf-list-type="ul">Double check ranges</li> <li data-xf-list-type="ul">Check inputs, settings, and output units in your ballistic calculator</li> <li data-xf-list-type="ul">check zero at 100 yards</li> <li data-xf-list-type="ul">calibrate velocity based on observed drop at ~80% of Mach 1.2</li> <li data-xf-list-type="ul">calibrate BC based on observed drops in transonic region.</li> </ul></blockquote><p></p>
[QUOTE="Tangent, post: 1666306, member: 110477"] I don't think there is enough information to say what the problem is. But, we can say that this is not solely a BC [U][I]or[/I][/U] MV issue. If we hold the velocity of 3,040 fps, and toggled BC to match drop at 1,600 yards using 3,200 fps (presumably with the factory BC of 0.348), the BC would need to be ~0.363. But this change in BC would not constitute a miss at 400 yards. For a MV of 3,140 fps, changing the BC from 0.348 to 0.363 accounts for 0.2-inches of difference at 400 yards compared to a MV of 3,140 fps with a BC of 0.348. If the scope is adjusting in SMOA (IPHY), I would expect that he would be shooting low compared to TMOA. But the scope could be part of the problem as well. To the OP, were you shooting paper or steel? If steel, did you go downrange to confirm hit location relative to center? Can you provide more specific information regarding real world drops and observed group sizes? I would also double check the following: [LIST] [*]Check torque settings on action screws [*]Make sure scope is properly mounted & torqued to rifle, set for eye relief, diopter is set to you, and that you are adjusting parallax correctly. [*]I would run a tall target test on your scope to check for tracking [*]Double check ranges [*]Check inputs, settings, and output units in your ballistic calculator [*]check zero at 100 yards [*]calibrate velocity based on observed drop at ~80% of Mach 1.2 [*]calibrate BC based on observed drops in transonic region. [/LIST] [/QUOTE]
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30 nolser velocity vs drop chart
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