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#5433930 - 11/20/14 03:43 PM build me a drop chart
Buzzsaw Offline
THF Celebrity

Registered: 06/29/11
Posts: 12923
Loc: Frisco, Texas
never was much of an engineer or ballistician so here is what I need,

6.5, 140gr Berger VLD Hunting BC: .612 (G1)
2900FPS

Show me two things, an MOA drop chart.

POI chart with a 200 yard zero, re; dead on at 50 yards, 2.5" high at 100yrds, 3.5" high at 300yards, But how can this be a 200 yd zero?

My BDC dial is set at 200yd zero but hits 3" high at 100, my dove sized brain cant make sense of this, what am I missing??? No, I'm not drunk, just sound like it

http://i122.photobucket.com/albums/o257/...p;1416519649985
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"I ain't here for a long time, I'm here for a good time"
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#5433933 - 11/20/14 03:44 PM Re: build me a drop chart [Re: Buzzsaw]
Buzzsaw Offline
THF Celebrity

Registered: 06/29/11
Posts: 12923
Loc: Frisco, Texas
sorry here is a picture

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"I ain't here for a long time, I'm here for a good time"
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#5433957 - 11/20/14 03:53 PM Re: build me a drop chart [Re: Buzzsaw]
Furb Offline
Pro Tracker

Registered: 09/06/05
Posts: 1798
Loc: Arlington, TX
_________________________
HHUUMMMM, what to write, what to write, I got nothing.

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#5433969 - 11/20/14 03:57 PM Re: build me a drop chart [Re: Buzzsaw]
howabouttheiris Offline
Light Foot

Registered: 04/11/14
Posts: 31
Need height over bore of the scope (measure center of bore to center of scope tube.

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#5433993 - 11/20/14 04:06 PM Re: build me a drop chart [Re: Buzzsaw]
howabouttheiris Offline
Light Foot

Registered: 04/11/14
Posts: 31

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#5434004 - 11/20/14 04:14 PM Re: build me a drop chart [Re: Buzzsaw]
howabouttheiris Offline
Light Foot

Registered: 04/11/14
Posts: 31
This image should help with your "why is my 200 yard zero also my 50 yard zero" and the "why am I high at 100" questions, as best as I understand your questions. (except you should be low at 300 vs high as you indicated in your email)




Edited by howabouttheiris (11/20/14 04:15 PM)

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#5434008 - 11/20/14 04:15 PM Re: build me a drop chart [Re: Buzzsaw]
Furb Offline
Pro Tracker

Registered: 09/06/05
Posts: 1798
Loc: Arlington, TX
What program is that ^
_________________________
HHUUMMMM, what to write, what to write, I got nothing.

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#5434012 - 11/20/14 04:17 PM Re: build me a drop chart [Re: Buzzsaw]
howabouttheiris Offline
Light Foot

Registered: 04/11/14
Posts: 31
JBM Ballistics... great calculator for trajectory/wind/moving-target-leads/transonic-boundaries/etc...

http://www.jbmballistics.com/cgi-bin/jbmtraj-5.1.cgi

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#5434164 - 11/20/14 05:55 PM Re: build me a drop chart [Re: Buzzsaw]
ChadTRG42 Offline
THF Celebrity

Registered: 09/16/09
Posts: 12871
Loc: Lewisville, TX
Is your Swaro in MOA or in 1/4"? There is a difference.
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www.DallasReloads.com
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#5434274 - 11/20/14 06:53 PM Re: build me a drop chart [Re: ChadTRG42]
howabouttheiris Offline
Light Foot

Registered: 04/11/14
Posts: 31
Hmmmm Scopes are not adjustable in inches. Although if set at 100 yards 1/4MOA is approximately 1/4".

The reticle on the scope is either an indication of MOA or MIL. Adjustments are in fractions of one of these. Typically 1/4MOA or 1/10MIL. (or finer adjustments for high end target scopes).

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#5434321 - 11/20/14 07:27 PM Re: build me a drop chart [Re: howabouttheiris]
wburke2010 Offline
THF Trophy Hunter

Registered: 06/26/13
Posts: 5096
Loc: Nevada, TX
Originally Posted By: howabouttheiris
Hmmmm Scopes are not adjustable in inches. Although if set at 100 yards 1/4MOA is approximately 1/4".

The reticle on the scope is either an indication of MOA or MIL. Adjustments are in fractions of one of these. Typically 1/4MOA or 1/10MIL. (or finer adjustments for high end target scopes).



There are some scope makers that say MOA but it truly is IPHY. There are also some scopes that are true IPHY. which is different than moa, by a bit.

Walter

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#5434352 - 11/20/14 07:43 PM Re: build me a drop chart [Re: wburke2010]
jeffbird Offline


Registered: 03/09/09
Posts: 3019
Originally Posted By: wburke2010
Originally Posted By: howabouttheiris
Hmmmm Scopes are not adjustable in inches. Although if set at 100 yards 1/4MOA is approximately 1/4".

The reticle on the scope is either an indication of MOA or MIL. Adjustments are in fractions of one of these. Typically 1/4MOA or 1/10MIL. (or finer adjustments for high end target scopes).



There are some scope makers that say MOA but it truly is IPHY. There are also some scopes that are true IPHY. which is different than moa, by a bit.

Walter


4.7% difference between MOA and IPHY, which matters depending on distance and the size of the target.

Buzz,

Set it for a true zero at 100 yards, then use the chart to generate a correction for the distances that will really be shot. Then go shoot those distances to obtain an true reading of the scope setting for each distance. Scopes can do odd things that do not necessarily match the charts, especially hunting scopes. Also, check in different temperatures as ammo velocity will change with the ambient temps. If you have a "smart" phone, ballistic software/apps can be downloaded for $10 or less. Some even will pick up local weather to automatically correct for local conditions.

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#5434372 - 11/20/14 07:50 PM Re: build me a drop chart [Re: jeffbird]
wburke2010 Offline
THF Trophy Hunter

Registered: 06/26/13
Posts: 5096
Loc: Nevada, TX
Originally Posted By: jeffbird
Originally Posted By: wburke2010
Originally Posted By: howabouttheiris
Hmmmm Scopes are not adjustable in inches. Although if set at 100 yards 1/4MOA is approximately 1/4".

The reticle on the scope is either an indication of MOA or MIL. Adjustments are in fractions of one of these. Typically 1/4MOA or 1/10MIL. (or finer adjustments for high end target scopes).



There are some scope makers that say MOA but it truly is IPHY. There are also some scopes that are true IPHY. which is different than moa, by a bit.

Walter


4.7% difference between MOA and IPHY, which matters depending on distance and the size of the target.

Buzz,

Set it for a true zero at 100 yards, then use the chart to generate a correction for the distances that will really be shot. Then go shoot those distances to obtain an true reading of the scope setting for each distance. Scopes can do odd things that do not necessarily match the charts, especially hunting scopes. Also, check in different temperatures as ammo velocity will change with the ambient temps. If you have a "smart" phone, software/apps can be downloaded for $10 or less that will correct for difference in air density, wind, and even powder velocity differences once you document them.


Bingo! That is the best to do with any scope.

Walter

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#5434462 - 11/20/14 08:50 PM Re: build me a drop chart [Re: Buzzsaw]
FiremanJG Offline
THF Celebrity

Registered: 12/16/08
Posts: 24866
Loc: Wolfe City, TX
These guys have handled most of it.

I will illustrate one more thing. Shoot paper at 10 yards. POA on a 1/4" dot. Where will your bullet impact? Below the dot you aimed at, right? That is sight offaet. You aiming device (scope) is sitting between 1.5" and 2.25' above the bore. The offset is why you have to hold OVER at 50 yards from a 100 yard zero, same as you have to hold OVER at 200 yards. They just happen to match.

I've had to shoot 1 MOA at 7 yards. Yes, 7. The correction is dial impact UP 6.2 Mil, which happens to be the same correction for 850 yards.
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#5434525 - 11/20/14 09:23 PM Re: build me a drop chart [Re: Buzzsaw]
RiverRider Offline
THF Trophy Hunter

Registered: 11/11/07
Posts: 8056
Loc: Wise Co.
It's hard to understand why this is all so hard to understand.
frown
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I'm here to give and receive knowledge, not affirmation or adoration. If you don't like it, mierda dura. Intellectual honesty is not for fragile egos.

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