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View Poll Results: Do you use an Angle Cosine Indicator on uphill/downhill shots?
Yes, of course! 324 24.40%
No, I don't need it where I hunt. 541 40.74%
No, but I really should use one. 463 34.86%
Voters: 1328. You may not vote on this poll

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Do you use an Angle Cosine Indicator (ACI) for uphill/downhill shots?

 
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  #36  
Old 01-29-2012, 03:38 PM
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Re: Do you use an Angle Cosine Indicator (ACI) for uphill/downhill shots?

I shot a black bear at 535 yards on a 37 degree down inclination using a NightForce Velocity reticle. Can anyone guess what yardage line I needed to hold on to make a perfect shot? BTW, I did make a perfect shot with a McMillan EOL Outdoorsman in 300 EOL mag. the a 5.5-22x56 NF scope with the above mentioned reticle, level and ACI installed on the ring cap. This is a standard set up for our EOL packages.
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  #37  
Old 01-29-2012, 05:37 PM
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Re: Do you use an Angle Cosine Indicator (ACI) for uphill/downhill shots?

I'd a dialed about 425 yards and let it fly. cosine for that angle is about -20 yds per 100.
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  #38  
Old 01-29-2012, 06:22 PM
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Re: Do you use an Angle Cosine Indicator (ACI) for uphill/downhill shots?

Right on. Sniper Tools Design Co ACI Durability Test - YouTube
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  #39  
Old 01-29-2012, 10:13 PM
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Re: Do you use an Angle Cosine Indicator (ACI) for uphill/downhill shots?

Quote:
Originally Posted by McMillan View Post
I shot a black bear at 535 yards on a 37 degree down inclination using a NightForce Velocity reticle. Can anyone guess what yardage line I needed to hold on to make a perfect shot? BTW, I did make a perfect shot with a McMillan EOL Outdoorsman in 300 EOL mag. the a 5.5-22x56 NF scope with the above mentioned reticle, level and ACI installed on the ring cap. This is a standard set up for our EOL packages.

Since my equipment is much older than your using. I have to rely on visual sightings to acheive angle degree, it is necessary for me to consult a known
trajectory scale for a given weight. also The wind factor if any, the the time of
day for possible correction for mirage if any. I'd pray for a perfect miss rather
than a hit that wasn't perfect.

Good Luck and keep them in the middle.
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  #40  
Old 01-30-2012, 12:05 AM
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Re: Do you use an Angle Cosine Indicator (ACI) for uphill/downhill shots?

I actually held right on 500. It was suggested 20 yards per 100 but that may be uphill rather than downhill.
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  #41  
Old 01-30-2012, 07:43 AM
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Re: Do you use an Angle Cosine Indicator (ACI) for uphill/downhill shots?

Uphill and downhill are both the same. You will subtract yardage for both. You were very lucky to have hit the bear at all.
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Last edited by paphil; 01-30-2012 at 07:48 AM. Reason: to add more comment
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  #42  
Old 01-30-2012, 10:13 AM
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Re: Do you use an Angle Cosine Indicator (ACI) for uphill/downhill shots?

I guess the reason I was able to hit the bear was that I made exactly the compensation the NightForce ballistic program told me to make, and it must have been right because the bullet went exactly where it was supposed to. The only thing I might possibly be wrong about is the angle of declination. Not sure I remember that exactly. What I do remember is that it was a real bear, no pun intended, getting back up the mountain. If you look at the angle of the spotting scope that will give you a true reading of the angle.
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