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# Maths question for someone with brains ?

#22
03-22-2008, 12:37 AM
 Platinum Member Join Date: Feb 2005 Location: Nevada Posts: 2,782
Down Under Hunter,

Your zero would be at 208 m.

Look at this:

At 100m 1 MOA = 1.1450"
20 MOA = 1.1450 X 20 = 22.9"
Now 22.9" + 2" = 24.9" So... I'd say that's close enough to 25.0".
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Our Lord Jesus said that as it was in the days of Noah and
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#23
03-25-2008, 01:35 AM
 Gold Member Join Date: May 2007 Location: VICTORIA AUSTRALIA Posts: 912
Eaglet,

As hunting season is only a week away I have the scope dialed accurately out to 940 M. After next week I plan on reshooting the 100 zero, do a ladder test, chrono the rifle, then take it to the range again for trajectory validation..

For what ever reason I cant get the pda exbal to match anywhere near the actual drops with a 2800-2850 speed. Always need a faster speed.

These are my drops tested and confirmed.

200 m 1.25 up, just high 1-2 "

300m 3.25 up, Just high 1-2 inch

400 5.25 up, Dead on !

530 8.5 up - DEAD ON !

700 M Got 15.75 up from exbal, divded by 1.09 = 14.5 up 3" high- Ill take it !

940 M Exbal gave 24 up so I divided that by the 1.09 as suggetsted to factor larger click values and got 22 up. Fired and landed at the base of plate. I would say 15 " low. The I ran out of rounds. I figure 23 up would be more like it. What do you think ?

Thanks boys, sorry to trouble you all but am rushing to get some drop numbers confirmed. I would not expect to shoot it next week past 600 anyway !

Cheers mates !

DUH
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#24
03-25-2008, 03:25 AM
 Platinum Member Join Date: Feb 2005 Location: Nevada Posts: 2,782
DUH,

Are you still 2" hight at 100m?
When your talking about the values going up, are you talking about MOAs or the values on your turrets which are 4 clicks to an inch at 100 yards?
__________________
-----------------------------

-----------------------------
HEBREWS 13:8
Jesus Christ the same yesterday, and to day, and for ever.

Our Lord Jesus said that as it was in the days of Noah and
also as it was in the days of Lot so it shall be in the days...
It's happening again!!! God sent to us His prophet, and His Word
to this generation and we once more are rejecting it as was prophesied!!!

---> As promised, God Sent His Prophet to us!
#25
03-25-2008, 04:02 PM
 Gold Member Join Date: May 2007 Location: VICTORIA AUSTRALIA Posts: 912
Eaglet,

The gun is still set 2" high at 100M.

When I talk aboout moa's I'm reading off the turrets, 4 clicks to an inch.
I plan on changing that immediately after my first season next week as I dont have time to verify the drops beforehand.

The values I list are MOA at 100 yards.- 1.25, 3.25, 5.25, 8.5, 14.5 and 23 ? as read off the NXS turret.

Can you see any pattern with this flight trajectory to suggest a prediated 2800 ish velocity with a 200 M ish zero. This is what feel Im dealing with. Until I can verify I'm trying to run some numbers and see if anything makes sense on exbal.

I ran a scenario that got me real close with 2940 fps and 140 M zero. But who knows. I'm happy to dial the above next week as they have all been confirmed on paper.

The one thing to remeber thoug is that 100M group moved 25 " up when 20 moa was dialed on the scope. This group was measured from the 2 " high group above the bull.

Thanks mate

DUH
__________________
With each step in the bush, you are a step closer.
#26
03-25-2008, 04:19 PM
 Platinum Member Join Date: Feb 2004 Location: Pennsyltucky Posts: 2,630
DUH, if you know what your drops are, why do you want the computer, especially if you're only shooting 600? i'd leave that thing at home and work off the drop chart.
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#27
03-25-2008, 04:24 PM
 Gold Member Join Date: May 2007 Location: VICTORIA AUSTRALIA Posts: 912
Dave,

I hear what you are saying mate !

I set this rig up for far greater shots though. This is just the first mission it will have. For what I want to do, I want the computer support to roll with conditions and corrections.

DUH
__________________
With each step in the bush, you are a step closer.
#28
03-26-2008, 03:38 AM
 Gold Member Join Date: May 2007 Location: VICTORIA AUSTRALIA Posts: 912
Quote:
 Originally Posted by Eaglet Down Under Hunter, Your zero would be at 208 m. Look at this: At 100m 1 MOA = 1.1450" 20 MOA = 1.1450 X 20 = 22.9" Now 22.9" + 2" = 24.9" So... I'd say that's close enough to 25.0". Then I would say your scope is dead on!!!
G'day mate !

Just want to make sure I get this clear. Are you saying that with my 100 m point of impact being 2 " high, then after turning my NXS two full turns ( 20 moa or 80 clicks ) my group should have moved up 25 " above the first group ? Thus making the second group 27 " above the bull ?

If this is so, I feel much better about the scope clicks being correct. I just thought the group should only have moved the 22.9 ".

Hope you can clear that stupid look off my face.

many thanks

DUH
__________________
With each step in the bush, you are a step closer.

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