Short answer: yes the manufacturers skew their numbers. Using different formulas for the BC calculation can do a lot to change their advertisements.

A truer BC is arrived at by shooting it at known distances and measuring speed and drop. Few manufactures use this method because it almost always results in lower BC numbers. A high BC is “really” only helpful on long range shots usually exceeding 300 yards. It is more important to find a round that is accurate in your rifle and use that. A high BC will not help you hit a long-range target if your riffle is not accurate with that round.

Find what round your rifle likes and then learn where it hits at different distances. You won’t be sorry.

mello