Just got a Leica HD-B. I set up a custom ballistic curve on the sd card. The curve is sighted in at 7500ft elevation. I'm running the horizontal ABS program. That's the one where it gives you an adjusted distance for angle and station pressure/temp. I live at sea level. So its 300ft elevation vs 7500ft sight in data. I can tell its adjusting for inclination but that's it. Shouldn't the shoot to distance show up farther than the ranged distance because of the denser air. I can range 1000 yards and the correction will be like 990. Which I'm almost sure is for the inclination. Can anyone help me out?
Leica hd-b help
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dougduey
Well-Known Member
It sounds like it's working fine. I have the same binos. I set it up for where I live (600' elev) and let it determine the change at higher elevation. Run the numbers through a ballistic calculator to see what the difference is. I used to live in CO and found that elevation differences between sea level and about 8000' was only 1 click difference with the cartridges that I use (7 STW, 300 WSM & 338 Lapua).
I'd call Leica and see what they say. Their customer service is really good. They'll give you a number for their tech specialist to contact directly and he'll get back with you in a day or two if you leave a voicemail. I had to send mine back in recently because they weren't ranging past 400 yards. They fixed the issue, put new eye cups on, cleaned it, and had it back to me in less than 2 weeks
I'd call Leica and see what they say. Their customer service is really good. They'll give you a number for their tech specialist to contact directly and he'll get back with you in a day or two if you leave a voicemail. I had to send mine back in recently because they weren't ranging past 400 yards. They fixed the issue, put new eye cups on, cleaned it, and had it back to me in less than 2 weeks
I'll call them tomorrow. There should be a decent difference between 7500 and 300 ft elevation at 1000 yards. And it never gives me a farther range. It's always a little less. If I get it setup for 7500ft the shoot to distance at sea level should be farther than actual. I'm sure it's probably operated error but I cant figure it out.
dougduey
Well-Known Member
I read your first post incorrectly...........so, yes, you're right, you do have an issue. I know they basically had to replace my laser and then recalibrated it to work properly. You may have a similar issue
I think you are supposed to input your actual sight in elevation not the elevation you intend to shoot at as the binocs/rangefinder will determine what altitude you are actually at when you get ready to shoot and will make the calculation for any needed differences from your sight in altitude vs the altitude you are getting ready to shoot from ... at least that's the way I understand it and the way I use mine.
graywolf
Well-Known Member
It corrects for barometric pressure by adjusting mil or moa not the distance it reports. The horizontal ABS equivalent distance measure is a trigonometric correction for angle that has nothing to do with barometric pressure/elevation.
The 990 yd readout you're interpreting as adjustment for elevation is probably an n error in the distance of your target.
When you set up the custom curve on the SD card you can input whether you want moa or mil (it says "1/3 moa")
The 990 yd readout you're interpreting as adjustment for elevation is probably an n error in the distance of your target.
When you set up the custom curve on the SD card you can input whether you want moa or mil (it says "1/3 moa")
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I talked to leica this morning. The horizontal range does adjust for station pressure but its baseline is sea level. So if your custom turret is setup for 7500ft elevation when you download that into the system it does not adjust the logic for 7500ft. It stays at sea level. So basically the sight in info is just for distance not elevation even though it has it there to input.
graywolf
Well-Known Member
I'm a little confused. Are you using a Leica scope with a custom turret?
I'm using a zeiss scope with a custom turret set at 7000ft elevation. I thought when I entered that info along with my load info into the HD-B it would adjust my shoot to distance in the horizontal setting since I'm now at sea level. It does not do that. The ballistics environmental logic is all baseline at sea level. So it will not work with a custom dial set for elevation higher than sea level. No big deal. I just didnt understand how it worked. Moral to the story is if you have a custom dial made for your load have it made for sea level then the HD-B will adjust it from there.
