I found an old post about calculating bullet trajectory. It had a link to the handloads.com calculator.
The results of the calculator do not seem to be correct.
I know from shooting in the Bullseye league using a 45ACP 200 grain LSWC in a 5 inch barrel sighted in at 25 yards did not have a 16.25 inch drop at 50 yards.
I am trying to calculate the trajectory of a 357Mag. 158 grain bullet at 1320FPS at 100 yards. I need to make sure that the bullet will not fall short of the berm and skip to an unsafe location.
Thanks for any help

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Using "Ballistic" for iPad, I calculate a 6.42" drop at 100 yards. I'm assuming you are using the iron sights, which have a sight height of approximately 0.75", and the bullet is a jacketed soft point (BC = 0.200).

Gravity accelerates any object downward at roughly 32 ft per second squared. So, if the bullet leaves the barrel flat (horizontal to the ground), it starts to fall at that rate. If, like with my hunting rifles, I sight in high, then the bullet actually arches upward before it begins its fall. Going up, it has a verticle deceleration of 32 ft per second squared until its verticle speed hits zero and then, it starts down at the rate of gravity. That is a fixed constant of physics. Sans air resistance, gravity is the same regardless of weight. That is, a feather and a lead weight in a vacuum will drop at the same rate. Your only other variable is the velocity of the projectile. Math says that the faster your bullet gets to its destination, the less that gravity will impact it as the main function is time squared. Time X Time is what gets you. Enjoy

I am not using iron sights. I am using a red dot UltraDot Sight. How do you figure sight hieght when using a red dot sight like the one in the photo?
Thanks

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Different guns will shoot the same load at different velocities which will affect the trajectory. The only way to be sure how your gun shoots at a certain distance is to shoot at that distance. If you are concerned about hitting the berm shoot at a distance your are sure to hit. Adjust your sights and back up.
Repeat until you are at your desired distance. Larry

Measure from the barrel's center to the center of the scope. That measurement won't be exact but close enough. Probably will be
around 1 1/2" - 2"

Thanks you very much..

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