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Posted: 12/25/2022 5:40:37 PM EDT
[Last Edit: outdoorgb]
Put in airgun forum as it is a question about my short-range shooting.
Beeman R7 with 2-7x32 scope Set at 4x power with range of 15' (lowest setting indicated on scope). Set AO. Rifle is zeroed at 20 yards and shoots pretty good. Was taking some sniper shots out of office window and target is 10' away. Missed twice, hit once but a bigger target (European Starling). So today I put my shoot-n-see targets and took five shots. the impact is about 1" low. Pretty certain this is a resultant of my 20 yard zero but would like some input from those who understand trajectory, short-range shooting, and general "how this works". When I raise up 1/2 mil dot, zero at 10 feet. 
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Posted: 12/25/2022 7:35:14 PM EDT
[Last Edit: PerpetualNewb]
[#1]
I could write a thing, but he's already done a good job on it. It's not a direct answer, but one you understand the articles you should know your answer. :)
https://www.pyramydair.com/blog/?s=distance+for+sighting+in&submit= https://www.pyramydair.com/blog/2007/10/why-are-there-two-zero-points-when-sighting-in-a-scope/ I think Tom also has a blog elsewhere, but this is where I found it on a Google search. He has published a wealth of info about many aspects of air gun shooting. |
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Posted: 12/25/2022 8:36:02 PM EDT
[#2]
Just like with firearms, the barrel is canted up, so that the projectile passes through the line of sight. Since you're sighted in at 20 yards, that's the point at which the projectile passes through on its way up. It'll drop back down through for a second point of impact. (Roughly 30 yards, according to that article).
The height from the muzzle to the top of that arch varies with different guns/bullets/powders/etc., and that's why some rounds are said to shoot flatter than others. One example is with normal loads, a .270 will have a flatter trajectory than a 30-06. The importance of that is allowing you to have a longer point of aim, meaning that you don't have to compensate for anything between the two points where the bullet crosses the line of sight.  Black - scope. Gray - barrel. Blue - line of sight, through the scope. Brown - bullet path, that should be shown as a smooth arch. I'm not steady enough with my mouse.  |
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Posted: 12/25/2022 10:37:19 PM EDT
[#3]
That’s what I suspected but could not wrap my brain around it…
Have my AR set at the RBSZ with irons but co-witnessed with a 1-4 score. Thanks all. I can hold over at 10 yards when needed. |
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Posted: 12/26/2022 11:18:44 AM EDT
[#4]
That’s why you shoot your data for different yardages. Scope height also plays a role.
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Posted: 12/26/2022 12:14:46 PM EDT
[#5]
Yes.. have some work to do. Setting up different distances in backyard today. Goal is to hit the bull at 10' to 50 yards. The guns will do it, now it's on me.
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Posted: 12/26/2022 4:19:58 PM EDT
[#6]
Quote HistoryOriginally Posted By outdoorgb: Yes.. have some work to do. Setting up different distances in backyard today. Goal is to hit the bull at 10' to 50 yards. The guns will do it, now it's on me. StrelokPro has some pretty good data for JSB pellets.  Attached File |
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Posted: 12/26/2022 8:12:58 PM EDT
[#7]
When I shot a lot of Field Target (a game in which targets vary from 10 yards to 55 yards), I found that a 33 yard half mil-dot above line of sight zero was about perfect. A ten yard target used the same hold as a 50 yard target. However, my scope height was a bit higher than is usual. A ten foot distant target would be a significantly higher hold up.
There is another game that I play in the winter with my 10 meter rifle, namely Bell Target in which the target is a .375" diameter hole at 7 yards. I have to click up 35 on my 10 meter aperture sight to be centered. |
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Posted: 12/27/2022 4:57:28 PM EDT
[#8]
Quote HistoryOriginally Posted By sparkyD: StrelokPro has some pretty good data for JSB pellets. https://www.ar15.com/media/mediaFiles/232954/F513D3D9-42C9-484D-843C-AF263F2BCE31_png-2649695.JPG I understand the "vertical" over/under hold, but why would there be a need for "horizonal" hold? If, that is what the R and L measurement mean. Shouldn't horizonal be determined by the wind direction and speed? |
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Posted: 12/27/2022 8:21:58 PM EDT
[#9]
Quote HistoryOriginally Posted By Triumphman: I understand the "vertical" over/under hold, but why would there be a need for "horizonal" hold? If, that is what the R and L measurement mean. Shouldn't horizonal be determined by the wind direction and speed? Looks like I had the spin drift setting on. But I have not noticed enough spin drift to worry with it. |
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