Trajectory Calculation Question

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BigMikey76

New member
I cannot tell a lie... I suck at math. I am trying to figure out where to zero my .22 for effective cottontail hunting. The ammo I am using right now is 37 grain hollow point with MV at 1280 fps (according to the manufacturer). The range I have available only goes out to 25 yards, but I feel comfortable with taking shots out to about 75 yards (maybe farther by next wabbit season, depending on how much better I get by then). Is there an elevation at which I can zero my scope that will allow me to take point of aim shots at distances ranging from point blank to 75 yards and still keep my shot in the kill zone?

Also, is there a good calculator you would recommend for figuring these things out on my own in the future?
 
There are lots of good online programs to calculate longrange centerfire cartridges, but they all start at 100 yards. You'll just have to find some way to put up some targets at various ranges to know for sure. I use some of the trajectory programs for my centerfire rifles, but still actually shoot at those ranges to verify anyway.

I zero my 22's at 50 yards and cannot tell any real difference at 25. When I shoot at 100 yards I'm usually around 4" low if that helps.
 
Standard velocity .22 rimfire zeroed at 50 yards drops about 7 inches from point of aim at 100 yards. The stuff you use will drop about 6 inches at 100 with its zero at 50.

Zero about 1.5 inches high at 50 yards and you'll be very close to zero at 75 yards. Or zero 1 inch high at 50 and you'll be about half an inch low at 75.

Which ever one you choose, check at the actual ranges.
 
Thanks guys. I suspected I would get that answer. I have found a few good centerfire calculators, but nothing that seems to work for .22. guess I will just have to find a longer range to do some trial and error.
 
According to my FTE ballistic calculator, for your specs which appear to be Winchester rounds, assuming a 75 yard zero your bullet drop is as follows:
25 Yds - +0.57"; 50 Yds - +1.14"; 75 Yds - 0.0"; 100 Yds - -2.89"

Zeroed at 100 yards gives the following result:
25 Yds - +1.33"; 50 Yds - +2.67"; 75 Yds - +2.29"; 100 Yds - 0.0"; 119 Yds - -2.93"

Hope this helps!
 
And I sure hope your sights are kinda close to the barrel.

I picked up an AR in 22 caliber, with standard iron sights. They are 2.5 inches above the barrel.

So if I zero at 50 yards (peak of the trajectory), I have to crank up the rear sight for 25, drop it down for 50, then back up for anything greater than 50 yards. Hard to swallow, but that is the way it is!

I fought a similar battle years ago sighting in my AR in 223 - hard to do at 25 yards!
 
Thanks, Stealth01. That's exactly what I was looking for. Is that an online calculator, or something I would have to pick up?
 
This is the data I used

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25 yard zero and 75 yard zero
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no clue. this was from ballistic.zdziarski.com maybe they have one for android. the ap was 20 bucks. theres another one made by another co thats supposed to be more advanced for 30 but i didnt like the U/I on it. winchester has a free app on iphone, pretty good by itself.
 
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