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Where is 600yd POI likely to move to????

 
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  #1  
Old 06-05-2011, 09:15 PM
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Location: GSP, SC, USA
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Where is 600yd POI likely to move to????

Please give me your most educated projection of where my POI will be in NOV for the 600 yd “pin-bar” @ 600 yds. when I go from 562' elev. in S.C. to 10,000' in CO and Tep. drops from 92 deg F to 10 -15 deg F. & your reasoning. (same conditions -no wind and BlueBird Day).
All our ranges are 100 yds. So I begged a farmer friend, he had a SAFE 610yd. Pasture.

18th year to same Mt.range in CO and I only have a 5% chance of a > 350 yd shot. But I want to get a feel for what the change should do!

Givens:
Rifle: Tikka T-3 SS Lite 338WM – 24” 1-10R, no brake, no bipod.(LOVES Dirty barrel >l0 < 30).
New Scope: Zeiss Victory FL Diavari 4-16x50T* with Rapid Z 800 Ret-(Ran a Zeiss zoom prog. And it came up with 14.76X = zero at 600 on 600 yd bar)
Ammo: Hornady GMX 185gr Superformance factory @3,080 fps. Advertised. (total 40 rounds-this ammo-total gun rounds 250 ish.)

4” between last 2 rounds @610 yds.!! Last round was 1” right and 1/4” down, pure luck.. With all the experience on here a bunch of you will have an opinion. Thats' all I want. What can I reasonably expect?? We ain't talking about me doing my part...just what the 185gr GMX @3,080 fps will do different.

Thanks


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  #2  
Old 06-06-2011, 01:17 AM
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Join Date: Oct 2009
Location: Thunder Basin, WY
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Re: Where is 600yd POI likely to move to????

Not a guess, but right out of the ballistic program.
Assuming 100 zero and standard atmosphere at both elevations, input the temp at both elevations, used 92 and 12.

The program gave 71.4" low and 11.25 moa at home
The program gave 64.6" low and 10.25 moa on the mountain.

If it were me, I'd still want to confirm a 100yd zero on the mountain and try a rock or something at 600 using the computer generated 10.25 moa holdover just to make sure. With your reticle, I believe you could use the full 16X for 600yds when on the mountain (if I did the math correctly). I am reverse calculating the 600 yd line is 10.5 moa low when on 16X...??

This is purely hypothetical and based on math and ballistic program. I've personally never went from one such extreme to another and shot, so I don't have any real world info for that. I have seen zero's change just in a few thousand feet of elevation though. I be thinking the extreme change in temps would also have an effect on velocity, maybe a small one, but I would expect it nonetheless.
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Old 06-06-2011, 02:24 AM
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Re: Where is 600yd POI likely to move to????

I just ran the same numbers SBruce did through my Shooter Droid App and came real close to his MOA.... only .25 MOA more for both locations...
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Old 06-06-2011, 02:27 AM
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Re: Where is 600yd POI likely to move to????

Quote:
Originally Posted by BuckSnort View Post
I just ran the same numbers SBruce did through my Shooter Droid App and came real close to his MOA.... only .25 MOA more for both locations...
The program I used rounds the moa correction to the nearest .25 moa. Does the Shooter app do the same thing, or round up to the next .25 moa? Just curious, never used that one.
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Old 06-06-2011, 02:30 AM
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Re: Where is 600yd POI likely to move to????

Yes, same way... to the nearest .25.... Really cool app so far, hope to get to use in on a high country buck this fall...
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Old 06-06-2011, 03:08 AM
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Re: Where is 600yd POI likely to move to????

SBruce, I must have had a brain fart earlier ...it goes to the nearest 1/10 of MOA....
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Old 06-06-2011, 03:17 AM
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Re: Where is 600yd POI likely to move to????

Quote:
Originally Posted by BuckSnort View Post
SBruce, I must have had a brain fart earlier ...it goes to the nearest 1/10 of MOA....
Glad you mentioned that, I now see that mine will go 1/10 also, but I have to change the settings under "sight adjustment options". Default is closest 1/4 minute.
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