The SG number that is best is between 1.5 and 1.6. A bullet with a SG between 1.5 and 1.6 ensures adequate stability and maximizes the Ballistic Coefficient (BC) of the bullet. Having an SG between 1.5 and 1.6 also allows for some margin of error. The Miller formula used to predict SG is accurate within +/- 10%, so having 0.5-0.6 margin of error ensures you will get the most optimal stability out of your bullet. An SG greater than 1.6 may result in bullet failures due to excessive friction on the bullet’s jacket.