POI change?

juice1304

I use M-Pro7 It is a bit more expensive but it lasts and dose a fantastic job. It is non toxic too.

juice1304

https://www.youtube.com/watch?v=QQKhlo2Ffug

zen260

once you are shooting at a 45 degree angle or over,be it upwards or downwards you will always shoot high as apposed to flat shooting,,,

Mackcon

juice1304 wrote: »

https://www.youtube.com/watch?v=QQKhlo2Ffug

Thanks pal il give it a bash

German pointer

sniperman wrote: »

hi all,was out with me hmr yesterday to check zero at 100 yrds,all was fine,groups within 1",so as i was out, decided to go to a sand quarry i have permission on, to have a few shots at rabbits,went up on a bit of a hill looking down,about 10 feet up, so im now shooting downward.first rabbit popped out about 90 yrds,bang,about 2" over head,same with the next 4,thought something wrong,went back down to level ground to check zero again,she was bang on,,so my question is would POI change form shooting level 1"groups to shooting 2" high downwards,any thoughts/advice welcome,

Have a look at the link below for a real life test

http://www.youtube.com/watch?v=0mygTqP88FA

hiddenmongoose

zen260 wrote: »

once you are shooting at a 45 degree angle or over,be it upwards or downwards you will always shoot high as apposed to flat shooting,,,

Not as simple as that.It doesnt take as big an angle.It depends on distance and angle .And then you must consider how flat your calibre is and what the danger space/allowence for error you can have on your target as to whether its of any importance.

A shot at 600 meters at 25 degrees (cos 0.906) equals 543m .Now thats a difference of 60 meters .at 600m for my 308 I need 3.9mils ,for 540 I only need 3.4mils thats .5 mils of a difference using the riflemans rule..5 mils too much at 540m equals being 27cm high.
Same distance same angle with the improved riflemans rule is 3.9 mils by .906 equals 3.5 mils dialled for that shot.

lefthooker

This is why I think a rangefinder with built in angle compensator is worth having. Its easy to misjudge distance when shooting up or downhill.
After checking zero on my .204 I went to shoot some steel. I placed a steel plate on a headland and walked 100 paces back up the field. Whipped out my Leica but it only read 94yds. Corrected with another 6 paces. After that stepped another 100 paces out to what should have been 200yds but the rangefinder only had 192 so needed another 8 paces. So what on the flat should have been 200yds in reality was only 186. Not a big deal cos the .204 shoots so flat and is zeroed @ 200yds. But that's an uphill rise of around 75yds, someone else can calculate the degree for me.

extremetaz

everypenny wrote: »

There is a big reward if you're shooting out to a big distance or from a large angle though. Shooting at 100 meters from only a 25 degree slope changes the range to 90 meters. (COS of 25 degrees =.9)

I wasn't disagreeing with you - What I was saying is that it's is a *VERY* good way of making that particular calculation accessible and easy to remember and perform.

dogcityroller

I use strelok for my android phone. It has a built in angle cosine. You just put the phone on the barrel and it works out the percentage for you. I shoot on fairly flat ground so I don't have much use for it in my 223. For shooting squirrels withe the air rifle it can come in handy to plot out areas I'm shooting in. You wouldn't believe some of the allowances you have to make when tour aiming at the tops of trees from the ground.