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Scope Canting

 
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  #1  
Old 06-19-2013, 01:56 PM
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Join Date: Oct 2012
Location: Utah
Posts: 68
Scope Canting

I know this is a subject that has been discussed before and I have gotten some sugestions. My problem is that my 7mm remington mag is spot on at 200 yards but at 600, 800, & 1,000 yards I had to hold left on the target to make a hit. I felt like what wind there was was a 6 o'clock wind and should not have made a difference in my shot. I have not yet checked the method were I shoot a series of shots at 100 yards moving my elevation turret up 5 to 10 MOA each time to track if the bullet is going off horizontal.

My question is this. I do not have a scope level on my Night force 5.5x22. If i was slightly canted could it make that much difference. I am not sure if I just need more experience reading the wind or what my issue is.

I am going to go out in a few days and shoot the 100 yrds changing the MOA's to see what my results are.
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  #2  
Old 06-19-2013, 02:07 PM
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Join Date: Oct 2012
Location: Utah
Posts: 68
Re: Scope Canting

It seems like at the 1,000 yard mark I was holding on the very left side of the target to hit the center. The target was very large metal plate. I think it is a 4 or 5 ft metal target.

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  #3  
Old 06-19-2013, 05:19 PM
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Join Date: Jan 2003
Location: The rifle range, or archery range or behind the computer in Alaska
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Re: Scope Canting

6 degrees of cant is barely detectable but can cause left or right missed of 4-6' at 1k. 6 degrees is the 1 minute hand on a clock. Not much.

Right hand hits at long range with a level scope/receiver is caused by spin drift and the coriolis effect.
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Long range shooting is a process that ends with a result. Once you start to focus on the result (where the shot goes, how big the group is, what your buck will score, what your match score is, what place you are in...) then you loose the capacity to focus on the process.
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  #4  
Old 06-19-2013, 07:25 PM
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Join Date: Dec 2010
Location: Fairview Alfa, Louisiana
Posts: 192
Re: Scope Canting

Spin drift ! is the most likely culprit . I add 1/2 min to the windage at 1000 yds with my 338 but consult a a balistic calc to figure yours . A scope canted to the left will counter the spin drift with a right hand drift . A right hand cant will exagerate it. The funny thing is with the right amount of cant you could have virtually no spin drift!
A scope level properly installed is indeed a good addition to any long range rig.
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  #5  
Old 06-20-2013, 11:11 AM
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Join Date: Apr 2012
Location: The cold part of Montana
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Re: Scope Canting

300gr 338 Berger MV of 2830 with a 1in10 twist has a spin+Coriolis drift of 1.4in at 1k, your canting your rifle (assuming 0 value wind), a scope level will go a long ways for you, I do the same thing myself.
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Keep in mind the animals we shoot for food and display are not bullet proof. Contrary to popular belief, they bleed and die just like they did a hundred years ago. Being competent with a given rifle is far more important than impressive ballistics and poor shootability. High velocity misses never put a steak in the freezer.

Joe
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  #6  
Old 06-20-2013, 11:56 AM
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Join Date: May 2007
Posts: 71
Re: Scope Canting

I recently added a scope level to my new Cooper. When at the range , I was very surprised to notice how many times I was canting the rifle to make small adjustments in the location of my crosshairs. I am now a believer and will soon have levels on more of my rifles. Midway has one on sale made by Wheeler that is inexpensive and folds back. It could be an issue if you forget to fold it back when not in use but I am trying one for a while to see.
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  #7  
Old 06-20-2013, 12:46 PM
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Join Date: Oct 2012
Location: Utah
Posts: 68
Re: Scope Canting

I know i am never going to win a Long Distance shooting contest with this gun at 1000 yrds. I just want to be able to produce reliable first round critical hits on an animal. My concern is that if I was holding 2 feet to the left and putting a 5 inch group in the middle of the target, even if there was a 9 o'clock 5 mph wind my chart says 7.83 inches or .75 MOA. If I was canting and there was a wind witch to me it seemed I had a 6 to 7 o'clock wind that was mild to no wind, maybe 3 MPH at best.

I am buying a scope level today but I can't go shoot again until Monday. I plan to double check the gun level and scope level just to see if there is an issue there. I also plan to shoot a target adjusting the MOA's up in 5 MOA increments. My hold over at 1000 yards is 20.49 MOA.

One thing I have learned there is always a variable that is making an effect. Its just a matter of ruling every possibility out until you find the solution. Just trying to start out with the most obvious ones first.
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