Shooting uphill/downhill

[Ozzy Fudd]

just wondering if the poi will change when shooting uphill or downhill?i can remember reading ages ao that if youre shooting uphill you should aim low (or was it high) and vice versa for downhill, but that was more to do with humans instintivley aiming off in those conditions.

 

anyone know? ill be shooting uphill, range about 60 yards, almost a 40 degree angle i reckon

[George1990]

I think if you're shooting high at something a fair distance away, then gravity will not affect the trajectory so much, so you don't need so much hold-over. As when you fire flat gravity acts perpendicular to the bullet.

 

Sounds logical but someone might know better.

Edited April 29, 2009 by George1990

[Ozzy Fudd]

cheers. im going to sight the rifle in tonight at 60 yards, but ill be on the same level as the target, so just wondering what effectes theresll be

[Beardo]

depends on the angle - but it does have an effect, 45 degrees (either up or down) = half the distance allowance for drop i think

[Ozzy Fudd]

so i should zero in at 30 yards then mate?

[Beardo]

keep the zero as it is for flat shooting, but holdover/under as you would for 30 yards (if it's 45 degrees - which is bloody steep!)

[Ozzy Fudd]

believe me it is bloody steep!! maybe not 45 degree but a closer to 40 than 30

 

problem is theres a house to the left and the right of the field and a road at the bottom, plus all the rabbits sit at the top near a hedge, so the only (and safest) way is to shoot up the field at them; cant use shotgun either as theres a horse kept in the field

[wymberley]

Not enough info to answer exactly, but assuming sub-sonic 40gr with zero at 50yds, up hill or downhill (it's the horizontal distance that matters) you'll be 0.73" high. If you can be more specific, only too pleased to help out.

Cheers

[Ozzy Fudd]

sorry! ill be using yellow jacket hyper velocity in a 10/22, range approx 60 yards, angle of the field close to (but maybe not quite) 40 degrees, gun needs re-zeroed at the mo anyway (zeroed at 100m at mo, dont ask )

 

cheers

[flytie]

Basically, if you shoot at a steep uphill or downhill angle, the bullet actually has less length of travel to be affected by gravity than if you were to shoot along a flat plane. There was an article on this in one of the rifle magazines recently-ish. Unfortunately I think I have given my copy of the magazine away. I will see if I can find something on line for you.

 

Atb, ft

 

PS Try this link; http://www.chuckhawks.com/shooting_uphill.htm

Edited April 29, 2009 by flytie

[Dunkield]

sorry! ill be using yellow jacket hyper velocity in a 10/22,

I'd be more worried about the bullet making it's way into the gun and out of the barrel

 

If it will cycle them, use subs

 

At the ranges you are talking about I wouldn't worry about elevation.

[flytie]

I till have the copy of the magazine, April 2009's Sporting Rifle Mag, page 57.

 

Atb, ft

[Beardo]

PS Try this link; http://www.chuckhawks.com/shooting_uphill.htm

 

tha's not some dodgy link to a 'suffolk speciality shooting uphill' site is it?

[Ozzy Fudd]

I'd be more worried about the bullet making it's way into the gun and out of the barrel

 

If it will cycle them, use subs

 

At the ranges you are talking about I wouldn't worry about elevation.

 

nope the only rounds my gun likes and will reliably cycle are yellow jackets, i once spent two days testing 20 or 30 different brands and they came up top's surprisingly. its quite funny, nce had a friend spend 15 minutes telling me off for using yellow jackets, then he proceeded to try and put some cci subs and eley's through; after his 5th jam for 8 shots he loaded up the yellow jackets and told me my 10/22 was just like me - an awkward ******* of a thing that has strange tastes :good:

 

sorry just been on a rat hunt, got the ****** hiding behind the washing machine . so basically, going by that link, i only have to worry about how far away the rabbits are really sitting and aim a bit low, so if i set my sights for 40 or 50 yards on the flat i should be right onto them then if theyre at 60 yards up the hill?

Edited April 29, 2009 by babbyc1000

[flytie]

tha's not some dodgy link to a 'suffolk speciality shooting uphill' site is it?

As far as I know nick, they are all god fearing american gun nuts, and not a "suffolk speciallity shooter", uphill or otherwise, among them

 

Atb, ft

[wymberley]

Hi,

OK, try a zero at 43yds.

[Ozzy Fudd]

cheers, went and paced the field out tonight, me and my mate both came to the conclusion it is roughly 60 yards (and i wasnt even wearing my glasses 1st time ) so i sighted in at about 45 yards tonight, need to take it out again next week and do a bit of fine tuning though - lying in a soaking wet field for 20 mins before you realise theres a hole in the crotch of your waterproofs is conductive for good shooting

[Beardo]

good luck - let us know how you get on

[Ozzy Fudd]

meant to come back to this before now, so heres an update. i have the 10/22 zeroed at 45 yards, and its dead on for the rabbits at 60 on the slope. having spent a good few nights in that field (tonight included) id now say the angle is about 35 degrees; range varies from 60 yards when shots are dead centre in front of the firing point (on top of a shipping container at the bottom of the field) out to 120 or so when shooting up and across. weve managed to get the job done anyway (at the mo), in the last week my uncles only seen 1 rabbit in the field compared to 5 or 10 every night when i first posted, so its good in a way that we got the job done, but its a bit annoying - ive now got the feel for the land and the ranges the rabbits sit at, but i cant put it into use now cos theres hardly any left in it!! :unsure: