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. |
