ballistic progam accuracy

[blacknwhite]

Well you know what they say about opinions. I just wondered if you had made a career of shooting or gun making. You certainly have a lot of experience/knowledge in this area. I enjoy your posts anyway. Keep em comin

 

[CatShooter]

Well I am pretty sure that Catshooter was not a kid that copied homework in school. Back when he was a kitten.

Oh, I'm running 105's at 3047fps at 4000 elev. Sometimes at 132ft above sea level..,portland matches).

Weather is a sunny 75 degrees, humidity 45%, 30.16 press.

Fly.

You can't give altitude AND baro pressure, unless you state if Baro is station pressure.

Here's why - the convention in the USA is that baro pressures are given,by the weather channel, radio, and airports) as corrected for sea level.

So if you live in Denver,6,000 feet), and the weather is "normal, the local station pressure,shooting pressure) is ~25 inches, but the weather given by any of the above sources will be 31 inches,A weather "high" pressure region), because they correct it down to sea level.

"Station Pressure" is the actual pressure that your bullet is pushing through, so that is what you need.

Now, all ballistic programs do the following... you put in the altitude, and the pressure from the radio, and the program takes the altitude and converts it back to sea level.

So you live in Denver and you put in 6,000 AMSL and 31 inches, and you will get the shooting solution for 6,000 AMSL, and that's a good thing...

But if you put in local "station pressure" you get a shooting solution for 12,000 feet... :, ... and that's a bad thing.

So lemme know where you got the pressure from - local station, or the radio?

I run it for you.

P.S... and "Sunny" doesn't count




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[Flybuster]

Ok I got the info on the net for the mountains. http://www.weather.com/weather/local/USOR0214

Sunny does count! Cloud over bullet down, sun up bullet up.

 

[CatShooter]

Ok I got the info on the net for the mountains. http://www.weather.com/weather/local/USOR0214

Sunny does count! Cloud over bullet down, sun up bullet up.

That "Sunny" poopoo is for iron sights. None of my bullets know,or care) if the sun is out.. I mix SPF 30 in with the powder


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[CatShooter]

It may not read well on this site - if it looks like crap, PM me your e-mail address and I will send it to you.

I put in a 3 O'clock, 10mph wind for you to get an idea of drift - you can use that as a base for corrections.


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BALLISTIC COEFFICIENT: 0.265
SIGHT HT.: 1.5 in.
ZEROED AT: 100 Yds.
INCLINE ANGLE: 0 deg.
WIND: from 3 O'clock at 10 mph

---

Here is for sea level.




BALLISTIC COEFFICIENT: 0.265
SIGHT HT.: 1.5 in.
ZEROED AT: 100 Yds.
INCLINE ANGLE: 0 deg.
WIND: from 3 O'clock at 10 mph
STANDING TARGET
ATMOSPHERE: Keyboard Entry
75° F./132 ft./31.16 in. HG/45% R.H.
'G7' VERY LOW DRAG

Range Vel. Energy Drop Path Defl. Time Lead
Yards fps Ft.Lbs. Inches Inches Inches Sec. Inches
0 3047 1340 0.00 -1.50 0.00 0.000 0.0
100 2861 1182 1.95 -0.00 -0.55 0.102 0.0
125 2816 1144 3.08 -0.27 -0.87 0.128 0.0
150 2771 1108 4.49 -0.81 -1.26 0.155 0.0
175 2726 1073 6.17 -1.63 -1.74 0.182 0.0
200 2682 1038 8.15 -2.75 -2.28 0.210 0.0
225 2638 1004 10.44 -4.17 -2.91 0.238 0.0
250 2595 972 13.03 -5.90 -3.63 0.267 0.0
275 2552 940 15.95 -7.95 -4.43 0.296 0.0
300 2509 908 19.20 -10.34 -5.31 0.326 0.0
325 2467 878 22.79 -13.07 -6.29 0.356 0.0
350 2425 849 26.74 -16.16 -7.35 0.386 0.0
375 2383 820 31.06 -19.62 -8.51 0.418 0.0
400 2342 792 35.77 -23.46 -9.76 0.449 0.0
425 2302 765 40.87 -27.70 -11.12 0.482 0.0
450 2261 738 46.38 -32.35 -12.57 0.514 0.0
475 2222 712 52.31 -37.42 -14.13 0.548 0.0
500 2182 687 58.69 -42.93 -15.79 0.582 0.0
525 2143 663 65.52 -48.90 -17.56 0.617 0.0
550 2105 639 72.82 -55.34 -19.45 0.652 0.0
575 2066 616 80.62 -62.27 -21.44 0.688 0.0
600 2028 594 88.92 -69.71 -23.56 0.725 0.0
625 1991 572 97.75 -77.68 -25.80 0.762 0.0
650 1954 551 107.13 -86.19 -28.16 0.800 0.0
675 1917 530 117.08 -95.28 -30.65 0.839 0.0
700 1880 510 127.62 -104.95 -33.27 0.878 0.0
725 1844 491 138.77 -115.25 -36.03 0.919 0.0
750 1808 472 150.56 -126.18 -38.93 0.960 0.0
775 1772 453 163.02 -137.77 -41.97 1.002 0.0
800 1737 435 176.17 -150.06 -45.16 1.044 0.0
825 1702 418 190.04 -163.06 -48.51 1.088 0.0
850 1667 401 204.66 -176.82 -52.01 1.132 0.0
875 1633 385 220.06 -191.36 -55.68 1.178 0.0
900 1599 369 236.28 -206.71 -59.52 1.224 0.0
925 1565 353 253.34 -222.92 -63.53 1.272 0.0
950 1531 338 271.30 -240.01 -67.73 1.320 0.0
975 1498 324 290.18 -258.02 -72.12 1.370 0.0
1000 1465 310 310.02 -277.01 -76.69 1.420 0.0


VITAL ZONE = 0.1 IN. POINT BLANK RANGE = 105.2 yds.
TRAJECTORY CROSSES LINE OF SIGHT AT 75 & 100 yds.
PATH IS 0.03 IN. OVER LINE OF SIGHT AT 87.5 yds.


STANDING TARGET
ATMOSPHERE: Keyboard Entry
75° F./4000 ft./31.16 in. HG/45% R.H.
'G7' VERY LOW DRAG

Range Vel. Energy Drop Path Defl. Time Lead
Yards fps Ft.Lbs. Inches Inches Inches Sec. Inches
0 3047 1340 0.00 -1.50 0.00 0.000 0.0
100 2855 1176 1.95 -0.00 -0.57 0.102 0.0
125 2808 1138 3.09 -0.27 -0.90 0.128 0.0
150 2762 1101 4.50 -0.82 -1.31 0.155 0.0
175 2716 1064 6.19 -1.65 -1.80 0.183 0.0
200 2670 1029 8.18 -2.77 -2.37 0.210 0.0
225 2625 994 10.47 -4.20 -3.02 0.239 0.0
250 2580 961 13.08 -5.94 -3.76 0.268 0.0
275 2535 928 16.02 -8.02 -4.59 0.297 0.0
300 2491 896 19.29 -10.42 -5.51 0.327 0.0
325 2448 865 22.91 -13.18 -6.53 0.357 0.0
350 2405 835 26.90 -16.30 -7.63 0.388 0.0
375 2362 805 31.26 -19.80 -8.84 0.419 0.0
400 2320 777 36.01 -23.69 -10.15 0.451 0.0
425 2278 749 41.16 -27.98 -11.56 0.484 0.0
450 2237 722 46.73 -32.69 -13.07 0.517 0.0
475 2196 696 52.74 -37.83 -14.70 0.551 0.0
500 2155 670 59.19 -43.42 -16.43 0.586 0.0
525 2115 646 66.12 -49.48 -18.28 0.621 0.0
550 2076 622 73.53 -56.03 -20.25 0.657 0.0
575 2036 598 81.44 -63.08 -22.34 0.693 0.0
600 1997 576 89.88 -70.65 -24.55 0.730 0.0
625 1959 554 98.86 -78.77 -26.90 0.768 0.0
650 1921 532 108.41 -87.46 -29.37 0.807 0.0
675 1883 512 118.55 -96.73 -31.98 0.846 0.0
700 1845 491 129.30 -106.62 -34.73 0.887 0.0
725 1808 472 140.69 -117.14 -37.63 0.928 0.0
750 1771 453 152.74 -128.33 -40.67 0.970 0.0
775 1735 434 165.49 -140.22 -43.87 1.012 0.0
800 1698 416 178.96 -152.82 -47.23 1.056 0.0
825 1663 399 193.18 -166.18 -50.75 1.101 0.0
850 1627 382 208.18 -180.32 -54.45 1.146 0.0
875 1592 366 224.01 -195.29 -58.32 1.193 0.0
900 1557 350 240.70 -211.11 -62.37 1.241 0.0
925 1522 334 258.28 -227.83 -66.62 1.289 0.0
950 1488 320 276.80 -245.48 -71.06 1.339 0.0
975 1454 305 296.30 -264.12 -75.70 1.390 0.0
1000 1421 291 316.83 -283.79 -80.56 1.442 0.0


VITAL ZONE = 0.1 IN. POINT BLANK RANGE = 105.2 yds.
TRAJECTORY CROSSES LINE OF SIGHT AT 75 & 100 yds.
PATH IS 0.03 IN. OVER LINE OF SIGHT AT 87.4 yds.

 

[Flybuster]

That works. Mr."C"

Is that M.O.A drop or I.P.H.Y.?

Here's what I got for G-1 for comparison's sake.

0 -1.5 *** 0.0 *** 3052.2 2.716 2171.6 0.000 0.0 ***
25 -0.8 -3.0
50 -0.3 -0.5
75 -0.0 -0.0
100 -0.0 -0.0
125 -0.3 -0.2
150 -0.8 -0.5
175 -1.6 -0.9
200 -2.6 -1.3
225 -4.0 -1.8
250 -5.7 -2.3
275 -7.6 -2.8
300 -9.9 -3.3
325 -12.5 -3.8
350 -15.4 -4.4
375 -18.6 -5.0
400 -22.2 -5.6
425 -26.2 -6.2
450 -30.5 -6.8
475 -35.2 -7.4
500 -40.3 -8.1
525 -45.8 -8.7
550 -51.7 -9.4
575 -58.0 -10.1
600 -64.8 -10.8
625 -72.0 -11.5
650 -79.6 -12.3
675 -87.8 -13.0
700 -96.4 -13.8
725 -105.5 -14.6
750 -115.2 -15.4
775 -125.4 -16.2
800 -136.1 -17.0
825 -147.4 -17.9
850 -159.3 -18.7
875 -171.8 -19.6
900 -185.0 -20.6
950 -213.2 -22.4
975 -228.3 -23.4
1000 -244.1 -24.4

 

[CatShooter]

That works. Mr."C"

Is that M.O.A drop or I.P.H.Y.?

Here's what I got for G-1 for comparison's sake.

Heeenches per long thingies!

You don't really think I'm gonna compare all those itty bitty numbers, do you??


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[Flybuster]

Thats a whopping 6" difference at 600 yards.

See guys he's not such a bad guy afterall.

 

[Ackman]

...... The last thing I need to get is a shooting chrony. If all the correct data is entered into the program, will the program get me in the ballpark or would I be better off setting targets out at various ranges and go through that lengthy process? I want to make a very accurate ballistics chart, so when I dial in come up clicks I know

This is the key......"If all the correct data is entered..." So where you gonna get "correct data" about velocity? You won't get it from a loading manual or some load program. You may not want this answer, but not "the last thing," rather the FIRST thing you need is a chronograph. Putting estimated numbers into a ballistics program won't get you "a very accurate ballistics chart." It'll get you an estimated ballistics chart.

 

[Zermoid]

Take all the programs and numbers and stick'em where the sun don't shine!
If you want to KNOW where your bullet will hit at a given range go shoot at that range and take alot of notes.

P.S. - The bullet don't know how to read all those numbers anyway.

 

[CatShooter]

Take all the programs and numbers and stick'em where the sun don't shine!
If you want to KNOW where your bullet will hit at a given range go shoot at that range and take alot of notes.

P.S. - The bullet don't know how to read all those numbers anyway.

Now there's an intelligent addition to the thread


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[SlowpokeRodriguez]

Jezz----what an insightful post! We are agreeing on too much!!!

 

[CatShooter]

Jezz----what an insightful post! We are agreeing on too much!!!

Slow Pokie... this has GOT TO STOP!

We're both going to loose out reputations



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[Flybuster]

Take all the programs and numbers and stick'em where the sun don't shine!
If you want to KNOW where your bullet will hit at a given range go shoot at that range and take alot of notes.

P.S. - The bullet don't know how to read all those numbers anyway.

Well, I got the chance to try out the new drop chart that Catshooter so kindly put together for me. Using this G-7 formula is closer to actuality, than my previous drop chart. My last chart used G-1. Here's a quick comparison.
Berger 105 VLD @ 3050fps.
G-7 drop at 975 yards= -18.03
G-1 drop at 975 yards= -23.4
Actual drop 975 yards= -20.75

So I would say thats right in the ballpark. Considering it's 10 degrees hotter, than when the original chart was made.

Oh, here's the group I shot, prone off my fire-control rest.