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Dead on at 400, gun shoots left at 100?

 
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  #8  
Old 11-20-2012, 05:02 PM
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Re: Dead on at 400, gun shoots left at 100?

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Originally Posted by WEATHERBY460 View Post
if my crosshair is wrong, which way do i turn the scope when looking thru it...also

what is the best way to check the scope level...shoot at yards, then adjust the scope to the 400 yard mark and shoot it again at 100?
If you need to move it you'll move it in the direction of your impact so in your case that would be counter clockwise.

Put a plumbline out in front of your rifle 10-15ft so you can see it when your looking through your scope. Focus the scope. Level your rifle. You can open your mag box and strap an ordinary level under the magazine well. Put a small level on top of your turret. Look through the scope and see if the cross hairs line up perfectly with your plumbline. Make sure the action stays level. Adjust the scope until the turret level matches the action level. This is just a rough method you can do at home. There is a better way at the range where you shoot at a plumbline but I'll have to explain that in a bit, I'm at work right now.
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  #9  
Old 11-20-2012, 06:38 PM
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Re: Dead on at 400, gun shoots left at 100?

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Originally Posted by RTK View Post
Draw a long vertical and horizontal line on a piece of butcher paper with a level "after you have taped it up", shoot a 100 yard group then dial up 30MOA and shoot again. That will tell you if your scope is level or not, keep your reticle perfectly on the horizontal and vertical lines for both groups
This is what I was going to tell you. You want to draw an upside down T. Make sure the vertical line is perfectly plumb. Zero you rifle where the lines intersect. Then dial up 30moa and shoot another group. If it is hitting left twist the scope that direction, if right twist right. Do this test at 100yds and make sure your crosshairs are lined up with the lines on the target.
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  #10  
Old 11-21-2012, 03:25 AM
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Re: Dead on at 400, gun shoots left at 100?

Makes sense...thanks!!!!!!!!!!!!!!
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  #11  
Old 11-21-2012, 06:55 AM
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Re: Dead on at 400, gun shoots left at 100?

I think its everything that's been mentioned, your crosshair is slightly canted clockwise and needs straightened, also if your shooting 250grn and lighter bullets from a 9 twist savage barrel you have close to a 3:1 stability factor which will give you around 2.5moa spin drift at 1k yrds not sure at 400 but probably 1/2-5/8moa.
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  #12  
Old 11-21-2012, 08:57 PM
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Re: Dead on at 400, gun shoots left at 100?

Well...get it dead on at 100 and then you can shoot right at 400!!
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  #13  
Old 11-21-2012, 09:34 PM
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Re: Dead on at 400, gun shoots left at 100?

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Originally Posted by backwoods83 View Post
if your shooting 250grn and lighter bullets from a 9 twist savage barrel you have close to a 3:1 stability factor which will give you around 2.5moa spin drift at 1k yrds
Wow! That just seems like a huge amount of spin drift.
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  #14  
Old 11-21-2012, 10:59 PM
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Re: Dead on at 400, gun shoots left at 100?

Shooter says 1moa drift at sea level with 250grn smk's at 1k.
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