Swarovski Ballistic BRT Software Question

[Bronco]

Any decent ballistic program will work with this reticle, doesn't have to be Swaro's. Just use the mil setting for elevation. Windage as I understand it is preset for max of 20 mph full value wind. Only problem with that is, what bullet at what speed and bc did they use for the calculation. If anyone knows the value of the hash marks on the windage part of the reticle, I'd like to have them so leads could be figured for movers.

Mounted mine up yesterday and set zero at 200 yd., used my standard ballistic program for come ups and hit 8" plates out to 400 with printout holds. Wonder why it has taken 10 years for this simple solution to come along?

[manderson2228]

Do you guys shoot a specific weight bullett to make it match up with the reticle or is there some way to allow it to adjust for any weight bullett. I am very new to the rifle shooting trying to figure it all out, ballistic programs, and reticles.. It really can make your head spin with you are starting out

[Bronco]

Do you guys shoot a specific weight bullett to make it match up with the reticle or is there some way to allow it to adjust for any weight bullett. I am very new to the rifle shooting trying to figure it all out, ballistic programs, and reticles.. It really can make your head spin with you are starting out

Reticle will work with any bullet at any velocity, just plug in your specific load to any mil based ballistic program and you will be close.

[Alaskapopo]

Do you guys shoot a specific weight bullett to make it match up with the reticle or is there some way to allow it to adjust for any weight bullett. I am very new to the rifle shooting trying to figure it all out, ballistic programs, and reticles.. It really can make your head spin with you are starting out

Reticle will work with any bullet at any velocity, just plug in your specific load to any mil based ballistic program and you will be close.

Can you explain it so those of us who are math impaired can understand.

Pat

[Bronco]

Below is the printout of my 3 gun load out to 600 yd. Fifth column from the left is Bullet path which shows come ups using a mil based reticle. AS you can see I've used a 200 yd. zero (1st column is distance to target scan to 5th. column and you see zero elevation required). Now go down to 500 yd. line and you'll see 2.99 mils of elevation are needed to hit the target. Use the third stadia line below the cross hair and it should hit (if you have doped the wind correctly).

The ballistic program handles all the math, all you have to do is remember the holds for the different ranges.

You can do the same with a moa based reticle, just a different value for the stadia lines.

1 mil = 3.6" @ 100 yd. or 36" @ 1000 yd.

1 moa = 1.04" @ 100 yd. or 10.4" @ 1000 yd. Most of the moa based turrets and reticles are actually set up in what has become known as IPHY (inch per hundred yards)which would yield a 10" value @ 1000 yd.

There are several ballistic programs available on the internet, JBM and Nightforce to name two. Your most important inputs are:

velocity of bullet

BC of bullet (can be found from manufacturer)

zero distance

height of scope above bore line

elevation where shooting

and to a lesser extent atmoshere conditions.

Hope this helps!

Keith

Well after I posted this I see it got shoved together and it is hard to tell which column is which.

1st Range to target.

2nd. Velocity of bullet.

3rd. Energy (ft. lb.)

4th. Drop in inches.

5th. Path in mils. This is your come up.

6th. Deflection in mils (wind)

7th. Time of flight.

8th. Lead in mils. (used for moving target)

CALIBER: .223

MUZZLE VELOCITY: 2750 fps

BULLET WEIGHT: 69 gr.

BALLISTIC COEFFICIENT: 0.169

SIGHT HT.: 2.25 in.

ZEROED AT: 200 Yds.

INCLINE ANGLE: 0 deg.

WIND: from 9 O'clock at 10 mph

TARGET SPEED: from 9 O'clock at 2.5 mph

ATMOSPHERE: Keyboard Entry

65° F./1120 ft./28.33 in. HG/60% R.H.

'G7' VERY LOW DRAG

Range Vel. Energy Drop Path Defl. Time Lead

Yards fps Ft.Lbs. Inches MILS MILS Sec. MILS

0 2750 1159 0.00 -- 0.00 0.000 --

50 2623 1054 0.59 0.19 0.13 0.056 1.4

100 2499 956 2.45 0.47 0.27 0.114 1.4

150 2378 866 5.70 0.30 0.41 0.176 1.5

200 2261 783 10.49 0.00 0.56 0.241 1.5

250 2147 706 16.98 -0.37 0.72 0.309 1.5

300 2036 635 25.35 -0.80 0.88 0.381 1.6

350 1928 570 35.83 -1.28 1.06 0.456 1.6

400 1823 509 48.64 -1.80 1.24 0.536 1.7

450 1721 454 64.07 -2.37 1.44 0.621 1.7

500 1621 403 82.44 -2.99 1.65 0.711 1.8

550 1524 356 104.12 -3.67 1.87 0.806 1.8

600 1429 313 129.54 -4.41 2.10 0.908 1.9

VITAL ZONE = 3.6 IN. POINT BLANK RANGE = 230.8 yds.

TRAJECTORY CROSSES LINE OF SIGHT AT 41.8 & 200 yds.

PATH IS 1.82 IN. OVER LINE OF SIGHT AT 125.4 yds.

(OR 0.412 MILS OVER LINE OF SIGHT AT 125.4 yds.

& 0.222 MILS UNDER LINE OF SIGHT AT 230.8 yds.)

Edited April 14, 2011 by Bronco