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angle shooting

09 Jun 2014
@ 02:39 am (GMT)

thomas kitchen

i was shooting some goats on the weekend short distance for most of the people on here but was struggling to hit them when i was shooting down a steep hill. don't no if it was me pulling the shots from an uncomfortable rest or the angle causing issues.
is there a calculation for how angles effect trajectory in 270win?
did manage to pull off longest one shot kill i have done later on which helped with the confidence

Replies

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09 Jun 2014
@ 05:36 pm (GMT)

Nathan Foster

Re: angle shooting
Hi Thomas, there is software that can calculate this if you ever wish to get into the finer details.

As for an example, lets say you were shooting a 130 grain bullet at 3060fps, sighted in 3" high at 100 yards for a 270 yard zero. If the angle is changed to 30 degrees (up or down), the bullet would strike roughly 3.3" high at 100 yards and 2" high at 270 yards.

We tend to get angles wrong when first attempting to predict them without some form of measuring tool or field work to build experience. It is not uncommon for a hunter to guess a steep angle as being 45 degrees when the angle is around 30 degrees which is common at lower altitudes. In mountainou country, steeper shots can occur. The steepest shot I have ever seen was one taken by Steph from the center of a creek in a ravine (a 4ft high boulder as a rest), shooting uphill at a Thar at a range of around 200 yards. Her .270 was sighted 3" high at 100 yards which should have set the 150gr SST 2.9" height at 200 yards. It seemed as if she was shooting straight uphill and although she aimed for the bottom third of the animal, the bullet struck too high. To take a finishing shot, she had to rest the crosshair on its belly line. The angle was between 50 and 60 degrees.

Obviously, the lower you sight your rifle at 100 yards (eg 2" high), the lower the deviation. Having said this, it is all too easy to handicap a good cartridge with a low trajectory resulting in misses, wounds or lost time taking distance readings and making calculations at ranges of around 300 yards.

I find that in basin country, 300 yards is a very short range as far as wind goes. In other words, the wind can easily swirl around to game. Also, if you are packing into an area and the track is a skyline track, game animals can visually pick up hunters at this range. In both instances, if an animal is seen, time can be a problem, the shot needs to be taken relatively quickly while the animal goes through its decision making processes. This is one of the reasons why I prefer a relatively high trajectory which allows shots to be taken at extended ranges without wasting time. I use the same setting for bush work since I am very much used to this system and besides, a 3" high setting is generally dead on between 25 and 26 yards. Others may well prefer to zero at 100 yards etc.

Shooting possums in Poplar trees is also steep work. With a 50 yard zero this puts me around 1" high at 35 yards and 2" high at 50 yards if shooting at 70 degrees. I generally lie on my back if shooting Poplar trees for extended periods to avoid neck strain.

10 Jun 2014
@ 03:12 am (GMT)

thomas kitchen

Re: angle shooting
cheers for that sounds like i just need to practice more in different situations angles etc.
its all new to me i only just updated from a lee enfield at the end of last year but manage a one shot kill at 315metres on sunday with my tikka so happy to learn all i can
10 Jun 2014
@ 09:59 pm (GMT)

faulkner

Re: angle shooting
Thomas the thing that helped me understand and improve on the angle shooting was to invission the horizontal distance to the target not the line of site if that makes sense?! If you had a goat at 400 meters up a hill at 30 degrees or "what ever" and if you dropped a imaginary plumb bob line that distance equaled 315 meters your golden!
If you have a large cliff its a good one to practice, or a smaller cliff and a .22 or even a bow can really help.
Well good luck and have fun with the Tikka! What caliber?? Aj
11 Jun 2014
@ 02:30 am (GMT)

Craig Buckland

Re: angle shooting
If you are interested I found this on youtube that explains shooting on angles. Helped me quite a bit. He also has good tutorials on MOA, wind etc.

https://www.youtube.com/watch?v=wTSBcNgGMNo
11 Jun 2014
@ 04:00 am (GMT)

thomas kitchen

Re: angle shooting
cheers for that guys it really simplifies it for me just got to make sure my estimates aren't to far out.
faulkner its a t3 lite in 270win I'm currently shooting hornady american whitetail ammo which is the 130grain interlocks they seem to shoot sub moa in my rifle but serious considering getting into reloading
11 Jun 2014
@ 04:38 am (GMT)

Mike Davis

Re: angle shooting
next time you are out and about and way up a hill and on your way home or some time when a shot wont spoil your hunt take a shot way down into a pool of water at say 7-800 yards it is eye opening to say the least just how little a bullet drops if angle is steep downhill. shooting hares with the .270 is really good to polish up the long range angle equation for you. be aware once you start to dabble into reloading you will get hooked !!! go to it you wont regret it.
11 Jun 2014
@ 04:42 am (GMT)

Kenney

Re: angle shooting
I would like to extend the original question if possible
- common sense says to me that for a perfect 100yrd zero you would have a target that is level with the bore. Let's say for testing purposes (group sizes) you have your targets at a significant angle, up or down. Is this going to have any effect other than the height that the groups strike the target?
11 Jun 2014
@ 06:32 pm (GMT)

Nathan Foster

Re: angle shooting
Hi Thomas, the only variables in this instance are how the angle effects shooting technique versus the effects of recoil. The rifle may "behave" differently based simply on changes in technique. Apart from this, all things should be equal.

Generally speaking, if you are using a Tikka T3, technique needs to be optimal at all times. The light weight of this rifle makes it very unforgiving with changes in technique. It is therefore important to practice in the field. Field targets, hares and rabbits are ideal for practice and I am sure you are eager to experiment with this in some manner. The full potential of the T3 cannot be utilized until this is fully understood. If you get a chance, please read my "Hold that Forend" article in the rifle accuracy section of the KB.
11 Jun 2014
@ 11:08 pm (GMT)

faulkner

Re: angle shooting
Thomas thats a great rig and caliber, reloading is a great hobby and you'll be able to really ring out the rifles potential. Nathan's hold the forend article can really help, it can be a bit shocking when a few groups are shot with a good hold and sling and what happens when the rifle is left to free recoil or a altered hold. Well good luck and have fun, Cheers, Aj
15 Jun 2014
@ 12:59 am (GMT)

thomas kitchen

Re: angle shooting
cheers for all your advice guys its really appreciated.
might print out "hold forend" and take it with me next time I'm practicing, always hold forend but never tried sling technique.
have you done a demo video on shooting technique nathan?
once again cheers to everyone and ill keep you posted how i get on
15 Jun 2014
@ 01:52 am (GMT)

Nathan Foster

Re: angle shooting
Hi Thomas, I have one small 5 minute video, a rough private listing that I share with clients in need. Other than this, I want to cover technique in book 5.
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