Thread: Tall target test

Originally Posted by Gibo

Could it be your bc?

I don't think so. If it was the BC I'd think I'd be seeing things before I got to 700 yds.
When I had the scope on the 7saum I had a correction factor because the scope was moving too far. I think now it is on a different rifle the 100yd zero is in the part of the scope adjustment where the clicks are 1/4 MOA but when I get past 700 I'm getting into the part of the adjustment where the clicks are more than 1/4MOA, probably closer to 1/3MOA.
To get to 700yds I need 14.7 MOA, to get to 800 I need 18.2 MOA, so an extra 3.5 MOA. If the clicks are 0.3MOA it will actually move 4.2MOA, which will be 5.6" high.
At 980 yds I need 25.1 MOA, which if the clicks are 0.3MOA would actually move 27.18 MOA, and I'd be 20" high.
This pretty much agrees with what I've seen in practice.
So i've got to do the check against a grid to see where the click values change, if they do.

Hey Stug , I guess the test of the scope fixed on a fixed platform and moving along a ruler at a 100 would tell you the thing.
Other wise it could be the tip of your amax melting down ;-) you need to shoot the eld's said the advertisement!

Originally Posted by stug

I don't think so. If it was the BC I'd think I'd be seeing things before I got to 700 yds.
When I had the scope on the 7saum I had a correction factor because the scope was moving too far. I think now it is on a different rifle the 100yd zero is in the part of the scope adjustment where the clicks are 1/4 MOA but when I get past 700 I'm getting into the part of the adjustment where the clicks are more than 1/4MOA, probably closer to 1/3MOA.
To get to 700yds I need 14.7 MOA, to get to 800 I need 18.2 MOA, so an extra 3.5 MOA. If the clicks are 0.3MOA it will actually move 4.2MOA, which will be 5.6" high.
At 980 yds I need 25.1 MOA, which if the clicks are 0.3MOA would actually move 27.18 MOA, and I'd be 20" high.
This pretty much agrees with what I've seen in practice.
So i've got to do the check against a grid to see where the click values change, if they do.

If that's the case, it sounds like a right pita Stu.

it's more of a technical problem rather than a practical, I've never shot at an animal further than 650yds. My average shot is just under 350yds so 700 yds is far enough. Once I know if it is the case it won't be hard to work out a cheat sheet.

Sell it

Originally Posted by stug

I'm going to have to do something like this. My elevation is good out to 700yds, past there I'm shooting high. I'll probably try something like Greg Duley does, but it is an absolute bugger getting everything set up so nothing moves.

You're not the only one. I'm typically 1 low/600 and 3 low/900. I just quantify it and then remove it. I don't know where the actual error is, but the trajectory is perfect after this.

Originally Posted by Friwi

Other wise it could be the tip of your amax melting down ;-) you need to shoot the eld's said the advertisement!

Yeah, I just binned my Amax and bought ELD. You should all do the same! The recycling bin is just outside my house

But seriously, look at some of the new ELD bcs. The .30 225gr arrived yesterday, damn that is a missile...

I'd wondered about the entire point of actually firing during this test at all. Wouldn't it be a lot cheaper just to put a measuring tape down a 1-2m board and then fix your rifle down so it can't move. Then just click up 100clicks to check you did rise 1m at 100m (milrad). Test that it returns to zero. Same left /right.

Why shoot?

Originally Posted by Dead is better

I'd wondered about the entire point of actually firing during this test at all. Wouldn't it be a lot cheaper just to put a measuring tape down a 1-2m board and then fix your rifle down so it can't move. Then just click up 100clicks to check you did rise 1m at 100m (milrad). Test that it returns to zero. Same left /right.

Why shoot?

Try it sometime & you will find its much easier just to shoot it

Only problem with shooting is you do need a very accurate rifle to get a good idea, but yes setting up a scope/rifle to do the test without shooting is a real pain.

Originally Posted by Dead is better

I'd wondered about the entire point of actually firing during this test at all. Wouldn't it be a lot cheaper just to put a measuring tape down a 1-2m board and then fix your rifle down so it can't move. Then just click up 100clicks to check you did rise 1m at 100m (milrad). Test that it returns to zero. Same left /right.

Why shoot?

Yep, IMO only way to do it i.e. statically, no shooting. After all you are only wanting to test the scope at this stage not the loads or the shooter's ability. Although having said that some faults in scopes may not show until wound to their extremities and require recoil to show up issue. But that is a different topic altogether.

I do the same as @6x47 posted. I have a chart made up of 2 A3 sheets joined together. The charts are printed accurately by using a cad program with the grid set at 1 MOA (1.047"). Some printers don’t always replicate the cad dimensions so there may be a need to fudge to get the correct result on paper. Some printers also may not give a linear result thru the total grid but as long as you have an accurate end point she should be good as. The two A3s joined together gives me 30 MOA to check with which should be adequate for the most shooting out to 1000 yds. I do a mid point check as well.

The range (100yds) I initially measured using a quality steel tape - only did that once. Happy now to believe my Zeiss rangefinder.

Yes, errors can creep in at each stage but still better than not knowing your scope’s true value. Even some of the top quality scopes can be out.

Other thing to remember is that if tying the rifle down and dialing scope that dialing UP makes the reticle go DOWN. So have zero at the top and 20 or 30 MOA at the bottom.

call me crazy but i am sticking with the test . . . because . . when my RF says its 100, 200, 300, 400 whatever thats what i have to use in the field . . . it maybe a little out but that doesnt matter, is it consistent, does my click value line up with what the RF is telling me.

why take the shooter out of the equation . .. if they dont understand there gear, if they can't shoot a decent group every time, everything they do is suspect . . this is not for the novice . . but that doesnt mean you shouldnt try, by failing we learn, untill we either give up or hopefully succeed . . . call me crazy.

i still have verify everything at the ranges i shoot, still have to fiddle with the balistic app to make everything fit . . . but i enjoy doing it . .. i am crazy, but it keeps me off the street, keeps me shooting . . thats good.

R.

Originally Posted by rossi.45

call me crazy but i am sticking with the test . . . because . . when my RF says its 100, 200, 300, 400 whatever thats what i have to use in the field . . . it maybe a little out but that doesnt matter, is it consistent, does my click value line up with what the RF is telling me.

why take the shooter out of the equation . .. if they dont understand there gear, if they can't shoot a decent group every time, everything they do is suspect . . this is not for the novice . . but that doesnt mean you shouldnt try, by failing we learn, untill we either give up or hopefully succeed . . . call me crazy.

i still have verify everything at the ranges i shoot, still have to fiddle with the balistic app to make everything fit . . . but i enjoy doing it . .. i am crazy, but it keeps me off the street, keeps me shooting . . thats good.

R.

Yep I agree fully.

The tall target test is also a great way of making sure your scope is properly level, as if it's not you induce a windage error as your dial up elavation.

Been there made that mistake

Originally Posted by rossi.45

call me crazy but i am sticking with the test . . . because . . when my RF says its 100, 200, 300, 400 whatever thats what i have to use in the field . . . it maybe a little out but that doesnt matter, is it consistent, does my click value line up with what the RF is telling me.

why take the shooter out of the equation . .. if they dont understand there gear, if they can't shoot a decent group every time, everything they do is suspect . . this is not for the novice . . but that doesnt mean you shouldnt try, by failing we learn, untill we either give up or hopefully succeed . . . call me crazy.

i still have verify everything at the ranges i shoot, still have to fiddle with the balistic app to make everything fit . . . but i enjoy doing it . .. i am crazy, but it keeps me off the street, keeps me shooting . . thats good.

R.

I use the same or similar method Greg D uses - mmm I am sure he understands his gear and is a capable shooter of groups.
The static test, which is only the starting point of the whole process, is just to confirm the value of the clicks, which can then be inputted into your ballistics program. And correct, it doesn't take the place of verifying at actual ranges the POI which then brings into play all the other variables eg shooter's ability, rifle's capability, calibre's capability, dealing with wind on the day, inaccurate distance measurements, dodgy BC claims by manufacturers, and so on.

And yes it's good to get shots down the barrel but my options of shooting regular sight in sessions at 1000 yds are zilch, so when I do lay down to shoot at 1000 yds for real I like to eliminate as many of the variables as possible before hand.