Some suggested changes to your parameters:
Use BC of .210 per Hornady - http://www.hornady.com/store/450-Bushmaster-250-gr-FTX-LEVERevolution/ (click on the detailsl button)
Cross sectional density of .175 (if called for by the calculator)
Wind speed 0 and wind direction of 12:00 or 6:00 (0 or 180 degrees) - take the wind out of the results for comparison.
Muzzle velocity of 2150 for factory load - based on some limited chrono tests
Sight height of 2.5 inches (or better yet, measure yours and use that, mine is about 3.25)
Here is a chart I prepared from several calculators. I couldn't upload a larger version that is more legible, but the Hornady results with a 100 yd zero are on the black line, my 5.11 Tactical Watch Ballistic Computer (Horus) is the orange line, the Big Game Info computer is the magenta line, and the average of these three is the green line. Note that even though the zero is at 100 yards and the Hornady computer gives a point at (100,0) the best fit polynomial curve is showing a rise of a few inches at 100 yards.
As someone else mentioned, we need field data to check the models.
Posted: Thu Feb 02, 2012 8:34 pm
