Updated URLs for JBM Online Ballistics Program
The web-based JBM Ballistics Program is one of the most sophisticated and accurate ballistics calculators available — and it’s free. The latest version of the JBM Trajectory Calculator includes field-test-derived actual G7 BCs, as well as bullet drag data from Lapua’s Doppler radar testing. You can also change weather variables, and generate come-up tables for distances out to 3000 yards.
Whenever we have web access, the JBM program is our “go-to” resource for dependable ballistics calculations. In our experience, with most bullets, if you input all the correct variables for the JBM program, it should get you within 1/2 moa (2 clicks), at 600 yards.
New URLs for JBM Ballistics Calculators
With the release of the latest version of the JBM program, some URLs for the calculations pages have changed. You may want to update your bookmarks with the following web addresses:
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JBM Calculations Entry Page: www.jbmballistics.com/ballistics/calculators/calculators.shtml. JBM Advanced Trajectory Calculator: www.jbmballistics.com/cgi-bin/jbmtraj-5.1.cgi. JBM Simple Trajectory Calculator: www.jbmballistics.com/cgi-bin/jbmtraj_simp-5.1.cgi. JBM Trajectory Cards (Come-up Table): http://www.jbmballistics.com/cgi-bin/jbmcard-5.1.cgi. |
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Tags: ballistics, Calculator, Come-Up Chart, Elevation, JBM, Trajectory, Windage
With all the PDA’s, Palm Pilots and I-Pads out there,JBM would do all of us a great service by offering their ballistic software in an I-Pad compatible format. JBM beats Horus for ease of use. I’d be willing to pay a reasonable fee for the program. Food for thought
Ballistic for iPhone/iPod Touch licenses JBM. Shooter for Android is supposed to be quite good. I’ve got one coming out for Windows Phone 7 that has almost identical results. So really no shortage of options.
I’ve used the JBM program for several years and printed and laminated range cards for my long range rifles. I shoot F-Open class and I’m constantly shooting at different distances (300, 600, 800, 900, 1000, 1200) and with a simple 300 yard known zero on my rifle, i can trust the JBM data to put me on target with the first shot at 1000 yards with little touch up needed on the scope for weather conditions. As long as the data you put in is accurate (scope height, ACTUAL velocity, elevation, etc.) it will reward you with great results.
You select a bullet and it still wants the bc info ect. not impressed, ill stick with the sierra program
Editor: If you select the bullet from the list, it WILL enter the BC data automatically. The fields still appear in order to allow manual tweaking. I think you’ll find, with some more familiarity with the program, that the JBM program does what you want, with great precision.