I recently used this in a 2200 yard match with great results; first shot was within 1 mil of the target. Easy to use, has support for the dealing with the coriolis effect, spin drift, etc. Like all ballistic computers, youll need good weather data to get the most accurate solution. The jury is still out on the bullet stability function, but the rest of the product is excellent.
MarkyMark765 about Bullet Flight M, v4.0.0