BulletDrop
Some people dont get the concept that gravity is the same no matter the mass (weight). A two grain bullet and a 500 grain bullet dropped at the same time from the same height or shot out of different level barrels at the same time and height, hit the ground at the same time. Even though they may land 100 yrds. apart. The flight time and drop time is the same for both. With that in mind, this calculator is very handy for reloaders and long rangers.
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BulletDrop