Rangefinders and aiming methods using projectile grouping

A method for aiming a projectile weapon that shoots a selected projectile having associated ballistic characteristics, comprising:

• obtaining a list of multiple types of projectiles and associated predetermined projectile groups, wherein each predetermined projectile group encompasses multiple types of projectiles on the list having similar ballistic characteristics, wherein each projectile group corresponds to one of multiple ballistic compensation settings;
• from the list, identifying the ballistic compensation setting corresponding to the projectile group encompassing the selected projectile;
• determining a range from a vantage point to a target;
• measuring an angle of inclination between the vantage point and the target;
• based on the range to the target, the angle of inclination, and the identified ballistic compensation setting, automatically determining an aiming adjustment for the projectile weapon;
• and
• aiming the projectile weapon based on the aiming adjustment.