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AR15.COM
11/23/2019 12:57:48 PM EDT
So I have a lane in my yard I can set up a target in, but near the end it slopes downhill. So at about 10 yards I’ll be shooting slightly downhill at it. From about 30 yards out it’s mostly level, then the drop. Any ideas how this will change sighting in at 10/20/30? Also since I’m practicing for shooting out of an elevated tree stand, will this screw me up in a big way?
11/23/2019 1:39:04 PM EDT
[#1]
You need to figure drop for the HORIZONTAL distance, not the SLOPE distance.

Gravity only affects drop with relation to the horizontal.
GD is like putting on crampons and walking through a room full of puppies.
11/23/2019 3:21:40 PM EDT
[Last Edit: JPK][Edited] [#2]
Quote History
Originally Posted By FredMan:
You need to figure drop for the HORIZONTAL distance, not the SLOPE distance.

Gravity only affects drop with relation to the horizontal.
View Quote
ETA: Same rules with a shotgun or rifle too.
11/23/2019 5:35:57 PM EDT
[#3]
Quote History
Originally Posted By JPK:

ETA: Same rules with a shotgun or rifle too.
View Quote
Yep.  That Gravity is a harsh, non-discriminating bitch.
GD is like putting on crampons and walking through a room full of puppies.
11/23/2019 8:19:55 PM EDT
[#4]
Quote History
Originally Posted By FredMan:
You need to figure drop for the HORIZONTAL distance, not the SLOPE distance.

Gravity only affects drop with relation to the horizontal.
View Quote
OK so here’s what I’ve figured today. The target is against a 6’ tall fence. With a measuring tape at the top of the fence, it’s horizontally level across to the grass/yard at the 10 yard mark. From there on to the back fence at 30 yards, it keeps level. So I should be fine to zero my 10/20/30 pins as long as I’m at the correct horizontal distance?
11/24/2019 7:12:24 PM EDT
[#5]
Quote History
Originally Posted By KELBEAST:

OK so here’s what I’ve figured today. The target is against a 6’ tall fence. With a measuring tape at the top of the fence, it’s horizontally level across to the grass/yard at the 10 yard mark. From there on to the back fence at 30 yards, it keeps level. So I should be fine to zero my 10/20/30 pins as long as I’m at the correct horizontal distance?
View Quote
Correct.  But verify.
GD is like putting on crampons and walking through a room full of puppies.
5/7/2020 11:45:50 PM EDT
[#6]
Most modern range finders have an angle compensator. They’ll give you the true horizontal value. If you plan on hunting, you’ll need one anyways.

Vortex, bushnell, sig all make good ones.

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