7mm STW Brotherhood - For those who shoot the 7mm Shooting Times Westerner

7stw · #**1751** 10-30-2012, 06:16 PM

Quote:

Originally Posted by ButterBean

Glad to know you guys are ok

Right back at cha'.
Thanks.

7stw · #**1752** 10-30-2012, 07:09 PM

Does any of the brethren have a ballistics calculator?? I am trying to figure drop on the 145 LRX bullet.
The stats are as follows.
Bullet 145 LRX
BC. .486
Speed. 3413 ave.
Caliber. ( obviously 7 mm).
Zero. 200-225
Temp. 30-50 ish.

The only thing I don't know is how to figure out what the humidity, or barometric pressure may be. I have read that some formulas ask for it.

What I want to do is make a chart of drops at different distances , given a 200 zero. My kid used to have a app on his phone, but doesn't have it anymore. Thanks to anyone who can help.

Dano1 · #**1753** 10-30-2012, 08:40 PM

7stw,

This is with your data adjusted for no altitude, since you live on the coast, 200yd Zero at 45 degrees F.

Dan

Ballistic Coefficient .486Velocity (ft/s)3413Weight (grains)145Maximum Range (yds)1000Interval (yds)25Drag Function G1Sight Height (inches)1.5Shooting Angle (degrees)0Zero Range (yds)200Wind Speed (mph)10Wind Angle (degrees)90Altitude (ft)0Pressure (hg)29.53Temperature (F)45Humidity (%)0.78Ballistic Coefficient .486Velocity (ft/s)3413Weight (grains)145Maximum Range (yds)1000Interval (yds)25Drag Function G1Sight Height (inches)1.5Shooting Angle (degrees)0Zero Range (yds)200Wind Speed (mph)10Wind Angle (degrees)90Altitude (ft)0Pressure (hg)29.53Temperature (F)45Humidity (%)0.78 Range Velocity Energy Trajectory TOF Drift
(yards) (fps) (ft-lb) (inches) (sec) (inches)
0 3413 3750 -1.50 0.0000 0.00
25 3356 3625 -0.59 0.0222 -0.03
50 3299 3505 0.13 0.0447 -0.13
75 3244 3387 0.65 0.0676 -0.30
100 3189 3273 0.96 0.0909 -0.54
125 3134 3163 1.06 0.1147 -0.85
150 3081 3055 0.94 0.1388 -1.23
175 3027 2951 0.59 0.1634 -1.69
200 2975 2850 -0.00 0.1883 -2.22
225 2923 2751 -0.83 0.2138 -2.83
250 2872 2656 -1.92 0.2397 -3.51
275 2822 2564 -3.27 0.2660 -4.28
300 2772 2474 -4.89 0.2928 -5.14
325 2723 2387 -6.80 0.3201 -6.08
350 2674 2303 -9.00 0.3479 -7.10
375 2626 2221 -11.50 0.3762 -8.21
400 2579 2141 -14.32 0.4050 -9.42
425 2532 2063 -17.46 0.4344 -10.72
450 2485 1988 -20.95 0.4643 -12.12
475 2439 1915 -24.78 0.4947 -13.61
500 2393 1844 -28.98 0.5258 -15.21
525 2348 1775 -33.56 0.5574 -16.91
550 2304 1709 -38.54 0.5896 -18.72
575 2260 1644 -43.92 0.6225 -20.64
600 2216 1581 -49.73 0.6560 -22.67
625 2173 1520 -55.98 0.6902 -24.82
650 2130 1461 -62.68 0.7251 -27.09
675 2088 1404 -69.87 0.7606 -29.48
700 2046 1348 -77.56 0.7969 -32.00
725 2005 1295 -85.77 0.8339 -34.65
750 1964 1242 -94.51 0.8717 -37.43
775 1924 1192 -103.82 0.9103 -40.35
800 1885 1143 -113.71 0.9497 -43.42
825 1845 1096 -124.22 0.9899 -46.63
850 1807 1051 -135.37 1.0309 -49.99
875 1769 1007 -147.18 1.0729 -53.51
900 1731 965 -159.68 1.1158 -57.19
925 1694 924 -172.91 1.1595 -61.03
950 1658 885 -186.89 1.2043 -65.04
975 1622 848 -201.67 1.2500 -69.22
1000 1588 811 -217.27 1.2967 -73.58

Black Sheep · #**1754** 10-30-2012, 08:41 PM

here ya go, from the g7 calculator here.
300=-1.5 350=-2.4 400=-3.3 450=-4.4 500=-5.4 550=-6.6 600=-7.8 650=-9.1 700=-10.4
These are all in moa
400ft elevation in Leominster, MA 40degrees, pressure 29.49, 50% humidity

on edit: Dangit Dano1, beat me to it!

Black67 · #**1755** 10-31-2012, 04:00 PM

Nosler Accubond Long Range!!!!!

Just read about this, another bullet to get and see how the rifle shoots with them. It looks like they will have 7mm in 150, 168, and 175 grs. The BC's are high, all over 600.

Hope these do come out soon!!!

gamehawker · #**1756** 10-31-2012, 04:12 PM

Quote:

Originally Posted by Black67

Nosler Accubond Long Range!!!!!

Just read about this, another bullet to get and see how the rifle shoots with them. It looks like they will have 7mm in 150, 168, and 175 grs. The BC's are high, all over 600.

Hope these do come out soon!!!

That would be awesome!!!

Here's the LRH thread talking about them:

INTRODUCING Accubond Long Range

7stw · #**1757** 10-31-2012, 04:50 PM

Dano, and Black sheep, I am blown away with the ballistics info.
Dano, that chart is amazing, and loaded with info. I have to sit and dissect it a little, and figure out how to utilize it. I am going to print it, and make a laminated business card size card, and either keep it with me, or stick it to my stock.
Black sheep, thank you very much also for the break down, as that is pretty much what I am going to end up with, or a combination of both.

I am very humbled and Thankful for all the info. THAT'S why I love this website!!!!
Take care, and I hope everybody is ok.