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Anyone with a Ballistics Program?

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28 September 2005, 02:49
Prewar70
Anyone with a Ballistics Program?
I was wondering is someone had a program and could run a trajectory for me on the following:

280 Improved
140 gr. Swift A frame or Northfork, flat base
3175-3200 fps
zeroed for 1" high @ 100 yds
zeroed for 2" high @ 100 yds

Thank you.
28 September 2005, 03:10
woods
Hey Prewar70

Factors: 280 Rem, 140 Swift A frame, 3200 fps, BC .335, Scope height 1.6", 1000' altitude, 40 degrees, 78% humidity

1" high at 100 yards: 200 yd -.5", 300 yds -7.1", 400 yds -24.1", 500 yds -40.2"

1" high at 200 yards: 100 yds +1.7", 300 yds -4.9", 400 yds -16.9", 500 yds -36.5"


____________________________________
There are those who would misteach us that to stick in a rut is consistency - and a virtue, and that to climb out of the rut is inconsistency - and a vice.
- Mark Twain |

Chinese Proverb: When someone shares something of value with you and you benefit from it, you have a moral obligation to share it with others.

___________________________________
28 September 2005, 04:27
jackfish
Sighting 2.5" high at 100 yards might improve your 6" diameter point blank range some. No more than 3" high or low out to 303 yds.

Factors: 280 Rem, 140 Swift A frame, 3200 fps, BC .335, Scope height 1.6", 1000' altitude, 40 degrees, 78% humidity

2.5" high at 100 yards: 200 yds 2.4", 300 yds -2.7", 400 yds -14.1", 500 yds -33.1


You learn something new everyday whether you want to or not.
28 September 2005, 05:07
woods
Just a suggestion

Try the Barnes Triple Shock 140 gr with a BC of .477 and the ballistics change:

1" high at 100 yards: 200 yd -.3", 300 yds -6.1", 400 yds -17", 500 yds -33.8"

1" high at 200 yards: 100 yds +1.6", 300 yds -4.3", 400 yds -14.6", 500 yds -30.8"

And the energy at 300 yards changes from 1754 foot pounds with the A frame to 2110 foot pounds with the TSX.

And your groups will probably be better.


____________________________________
There are those who would misteach us that to stick in a rut is consistency - and a virtue, and that to climb out of the rut is inconsistency - and a vice.
- Mark Twain |

Chinese Proverb: When someone shares something of value with you and you benefit from it, you have a moral obligation to share it with others.

___________________________________
28 September 2005, 05:37
Prewar70
Jackfish and Woods,

Thank you both. The Swift bullet is very accurate in my 280 Imp. and I hope to try the Northfork very soon as they just arrived in the mail. 2.5" at 100 yds sounds pretty good as you pointed out Jackfish.
28 September 2005, 07:10
Savage99
Download Pointblank at http://www.huntingnut.com and enter your data. Pay attention to the wind drift too as it can be more difficult than drop.

Print out the data for all loads and carry one in your pocket.


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28 September 2005, 07:45
Prewar70
Savage99,

That is awesome! I can't believe that kind of program is available for free. What more could a reloader ask for. Thank you.
28 September 2005, 18:52
Croberts
How do you set the zero for your rifle on this program? Thanks


A man should never stop learning, so a man should never stop asking questions
28 September 2005, 20:42
Savage99
Click on Ballistics Calculator at the top of the page and then View Data.

Find "Targ Dist" at the bottom and change that and click accept.


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