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Fine Tuning @ 1300

 
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  #1  
Old 09-28-2012, 10:49 AM
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Join Date: Feb 2012
Location: Western Colorado
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Fine Tuning @ 1300

I'm new to all this and have new equipment that I'm attempting to get working together. I have a 338LM, a G7 NF scope, and a B7 LRF. I still using factory HSM 300 gr VLDs, reloading is this winter's project...

Previously I was hitting consistently 2 - 3 feet high at 1300 yards so I adjusted the muzzle velocity in the G7 to correct, of course I first reduced muzzle velocity just to confuse myself, and ended up adjusting the FPS from 2780 to 2840 once I figured out the correct direction of adjustment.

With the light going fast and the wind going from a measured nothing to 5 mph I fired the last 3 rounds. Obviously I did not read the breeze correctly with a horizontal spread of 18". But the vertical spread, including the third shot in the dirt beside the plate, was about 6''.

I believe I can get the yardage, dial in a correction and be very close vertically. However, with winds 0 - 5 which is about as good of conditions as one can hope for, I was disappointed in the horizontal spread. I was shooting prone with bipods.

Any suggestions or pointers?
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  #2  
Old 09-28-2012, 12:33 PM
M67 M67 is offline
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Re: Fine Tuning @ 1300

At 1170m 18" or worse, horizontal is what you get if you are not on top of what the wind does. On can, certainly with the 338LM, shoot much better than that - But then you better watch the wind, near, far and in between.

K
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Old 09-28-2012, 12:51 PM
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Re: Fine Tuning @ 1300

Truth is I was really happy to have the elevation dialed in close enough for hits and didn't pay enough attention to the wind.

However, feeling/seeing the difference of less than 5 mph wind, while getting the shot off is gonna be a challenge for me I think...
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Old 09-28-2012, 01:12 PM
M67 M67 is offline
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Re: Fine Tuning @ 1300

Quote:
a challenge
Yep, wouldnt be much fair if if it was different for you.
K
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Old 09-28-2012, 01:47 PM
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Re: Fine Tuning @ 1300

Quote:
Originally Posted by M67 View Post
Yep, wouldnt be much fair if if it was different for you.
K
True. I'm wondering if a 0-5 wind was enough to cause that big of a horizontal spread? I suspect its not and if wind and the shooter are all that control horizontal spread(?) then something I'm doing or not doing is effecting the spread.

Any known bad habits cause horizontal spread much more than vertical spread?

Other than fast foods, of course...
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Old 09-28-2012, 02:03 PM
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Re: Fine Tuning @ 1300

The difference between zero wind and a 5 mph full value wind at 1300 yards would be about 1.4 moa. Or roughly 19". Then if you have a combined accuracy of 3/4 moa between the rifle, ammo and shooter skill you need to add that in too. So in reality if you are just getting started at this you did pretty good I feel. I would look at the distance of error from your pont of aim. Not group size. I strive to get as close to point of aim as possible no matter what side of it I am on. This is why I choose the crease behind the shoulder for point of aim. It offers me the widest kill zone and as you see width is tough with any wind at all. There is always wind somewhere durring the flight path.

Another thought I have is, were you able to split that circle aiming point with your cross hairs? Is the plate about 20" across?? The dot 2"?? If the crosshair subtension of your scope reticle is covering the dot completely it will induce a small amount of error too.

Lastly f you have not read this I think it is worth your time.
The importance of being Solid

You can not be to solid on your set up.

Jeff
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Old 09-28-2012, 02:52 PM
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Join Date: Feb 2012
Location: Western Colorado
Posts: 186
Re: Fine Tuning @ 1300

Quote:
Originally Posted by Broz View Post
The difference between zero wind and a 5 mph full value wind at 1300 yards would be about 1.4 moa. Or roughly 19". Then if you have a combined accuracy of 3/4 moa between the rifle, ammo and shooter skill you need to add that in too. So in reality if you are just getting started at this you did pretty good I feel. I would look at the distance of error from your pont of aim. Not group size. I strive to get as close to point of aim as possible no matter what side of it I am on. This is why I choose the crease behind the shoulder for point of aim. It offers me the widest kill zone and as you see width is tough with any wind at all. There is always wind somewhere durring the flight path.

Another thought I have is, were you able to split that circle aiming point with your cross hairs? Is the plate about 20" across?? The dot 2"?? If the crosshair subtension of your scope reticle is covering the dot completely it will induce a small amount of error too.

Lastly f you have not read this I think it is worth your time.
The importance of being Solid

You can not be to solid on your set up.

Jeff
Jeff, I'm sure all of us appreciate your input, I know I do. I have read the importance of being solid and you're right my set up wasn't 100%. I was using harris bipods and a rear bag on top of a large old cotton canvass, talcum powder dust there...

I believe the plate is about 2 feet wide with the dot 3'' to 4'', I'll measure the next time out. I can see enough of the dot with my cross hairs on it so I should be able to work on reducing that error.

I had 2.25 MOA dialed in for windage, the correction my B7 gave for 5mph at 1312 yards. Do you think that was too much?

Thanks for the advise about POA on game. One weekend left of bear season and then a bull and a cow tag to fill next month. The more of the bullet's 'pre-flight checklist' I can check off before the shot the more likely the freezer will fill up.

Jack
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