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 Rifles, Bullets, Barrels & Ballistics

# Ballistics Calculator Problems!

#8
02-17-2010, 10:12 AM
 Gold Member Join Date: Feb 2008 Location: Sonoma County, CA Posts: 827
Re: Ballistics Calculator Problems!

I did just a quick entry into Exbal using a guestimated 2475 fps, sight height of 1.5" and entered altitude at 6000 ft which gave a baro of 23.798, which should be close enough for this test. Drops shown are in MOA and clicks shown are assuming you have a 1/4 MOA turret.

300 yds: 5.25 (21 clicks)
400 yds. 8.75 (35 clicks)
600 yds. 16.75 (67 clicks)

100 yrds = 0 clicks
300 yrds = 22 clicks
400 yrds = 30 clicks
600 yrds = 47 clicks

300 and 400 yards are fairly close. Definately enough to hit a steel plate. There is a huge difference though at 600 yards. Still thinking????
#9
02-17-2010, 11:02 AM
 Platinum Member Join Date: Nov 2008 Location: SW Montana Posts: 5,802
Re: Ballistics Calculator Problems!

Quote:
 Originally Posted by Moman I did just a quick entry into Exbal using a guestimated 2475 fps, sight height of 1.5" and entered altitude at 6000 ft which gave a baro of 23.798, which should be close enough for this test. Drops shown are in MOA and clicks shown are assuming you have a 1/4 MOA turret. 300 yds: 5.25 (21 clicks) 400 yds. 8.75 (35 clicks) 600 yds. 16.75 (67 clicks) Your clicks were: 100 yrds = 0 clicks 300 yrds = 22 clicks 400 yrds = 30 clicks 600 yrds = 47 clicks 300 and 400 yards are fairly close. Definately enough to hit a steel plate. There is a huge difference though at 600 yards. Still thinking????
Using rough numbers in JBM I'm within a couple clicks of Moman also, the thing that got me thinking about range is that I get roughly 50 clicks for 500yrds which matches the rest of your trajectory.
Your range is more than likely set up better than mine, I have to double check cause people move stuff around, except the 1000 yrd pits. I've been trying to find some scrap steel to get some full size targets made, that sure would be nice!
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#10
02-17-2010, 12:26 PM
 Silver Member Join Date: Jun 2006 Location: buffalo, OK Posts: 400
Re: Ballistics Calculator Problems!

My exbal shows 15 - 16 moa at 600 yrds also. I did notice that it drops 1moa every 25 yards after 600 and way more at 800. I really think without mv you need to shoot farther range data. It looks like 600 is the point it starts dropping rapidly which could play hell figuring mv or bc farther out.
#11
02-17-2010, 07:48 PM
 Junior Member Join Date: Oct 2009 Posts: 26
Re: Ballistics Calculator Problems!

BigNGreen, my range is set up pretty well and people don't move the steel targets around. However, I have never actually taken the range finder out and ranged the steel. I just went off what the sign said. Next time I am out I will range it with the range finder.

How much does humidity play into it. I found out that humidity is about 40% higher than I had expected. But my calculator doesn't even ask for a humidity input so I can't imagine that it plays that much into it.
#12
02-17-2010, 07:50 PM
 Junior Member Join Date: Oct 2009 Posts: 26
Re: Ballistics Calculator Problems!

BTW, BigNGreen, I just noticed that you are from SW MT. I moved from Twin Bridges about 1 1/2 years ago and moved to Raton, NM. Where are you in MT?
#13
02-17-2010, 09:10 PM
 Platinum Member Join Date: Nov 2008 Location: SW Montana Posts: 5,802
Re: Ballistics Calculator Problems!

Quote:
 Originally Posted by lomfs24 BTW, BigNGreen, I just noticed that you are from SW MT. I moved from Twin Bridges about 1 1/2 years ago and moved to Raton, NM. Where are you in MT?
I just PM'ed ya, we may know each other
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"Pain is weakness leaving your body"
#14
02-17-2010, 09:17 PM
 Platinum Member Join Date: Nov 2008 Location: SW Montana Posts: 5,802
Re: Ballistics Calculator Problems!

Quote:
 Originally Posted by lomfs24 BigNGreen, my range is set up pretty well and people don't move the steel targets around. However, I have never actually taken the range finder out and ranged the steel. I just went off what the sign said. Next time I am out I will range it with the range finder. How much does humidity play into it. I found out that humidity is about 40% higher than I had expected. But my calculator doesn't even ask for a humidity input so I can't imagine that it plays that much into it.
Humidity plays a very little roll in the ranges your talking, just run it in JBM and you can see what makes big differences and what doesn't. Scope height can make for some odd stuff in those ranges also.
What scope are you using and how high?
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