The UK's Finest Independent Forum for Shooters and Gun Owners. Est 2010.

All

This may or may not be of use to people but I've found this website that gives you the ASL for any location using Google maps

http://www.daftlogic.com/sandbox-google ... titude.htm

Alan

I have a copy of the local OS data for my house and the daftlogic report is only out by around 12 metres! Not bad on a height of around 21m

Are you thinking in relation to different altitudes affecting exterior ballistics?

Embarrassingly I went off on a tangent with this a couple of years back. I took ASL readings, using maps, of a number of ranges in the UK and was somewhat confused to find that no where from the top of Ben Nevis to Sea level would have any effect on POI.
It turns out that you have to be looking at thousands of feet ASL to make a difference.

Should you zero at Bisley then fly out to Raton - New Mexico, you can expect to see a difference!

DM

Dangermouse wrote:Are you thinking in relation to different altitudes affecting exterior ballistics?

Embarrassingly I went off on a tangent with this a couple of years back. I took ASL readings, using maps, of a number of ranges in the UK and was somewhat confused to find that no where from the top of Ben Nevis to Sea level would have any effect on POI.
It turns out that you have to be looking at thousands of feet ASL to make a difference.

Should you zero at Bisley then fly out to Raton - New Mexico, you can expect to see a difference!

DM

Ironically I've just found that out, I put the figures in for Blair Atholl which is given as 910 feet and it made a whole .1 MOA difference

What I did find is that the difference in heights between the Firing points and Targets, i.e the 600 yard point at Diggle is 100 feet lower than the targets which is why I was possibly a little high when I started

Never mind it's quite interesting

Alan

I was just doing similar with Stickledown 1000 yard point to the Butts

What started me off was realising that there was a difference between the Short Siberia range, where a lot of people get their 100/200 yard zero and the right hand points on Sickledown.
Even standing on the Stickledown range you might think that there is a difference between the left hand points and the right hand, unless you are using some crazily accurate ballistics computer, it is not worth thinking about.

Certainly it is worth spending more time on your wind reading game and making sure that your loads are as consistent / accurate as possible.

DM

With regards to Diggle there is a secret about the wind which you need to learn when it is coming from the rear - no, not a joke.

Should you get the wind from the rear at Diggle it will affect you differently than at Bisley, one knocks you up the other down,

All fun,

DM

Dangermouse wrote:Are you thinking in relation to different altitudes affecting exterior ballistics?

Embarrassingly I went off on a tangent with this a couple of years back. I took ASL readings, using maps, of a number of ranges in the UK and was somewhat confused to find that no where from the top of Ben Nevis to Sea level would have any effect on POI.
It turns out that you have to be looking at thousands of feet ASL to make a difference.

Should you zero at Bisley then fly out to Raton - New Mexico, you can expect to see a difference!

DM

http://www.guardian.co.uk/science/2011/ ... tein-right

"After working for half a century and spending £500m, scientists last week revealed that they have detected strange fluctuations in Earth's orbit. Space-time is bent and then twisted round our planet as it rotates, announced researchers with Nasa's Gravity Probe B project."