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if you use a ballistic software package such as chairgun, you can calculate it by the FPS measured at two points of known distance, or by poi at zero and another known distance. The BC can be different between different barrels etc.
Thank you for your reply. I didn’t realise that the ballistic coefficient was directly linked to a change of velocity between two points on its flight path. Does that mean that the b c changes the further down its flight path it travels?
In theory, yes. In practice, at sub-12 airgun velocities you'll not need to worry about this. When using Chairgun you can select a BC profile for the projectile: use one for a similar shaped pellet from the database. You may find you will get different trajectories from different barrels even at the same muzzle velocity. The rifling, choke, and any damage to the pellet will affect the drag, so the BC will be specific to the pellet-barrel combination.
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