G1—Also known as Ingalls, G1 projectiles are flat-base bullets with a 2-calibre nose and are the most common type of bullet. G7—Bullets with the G7 BC are long 7.5-degree boattails with a 10-calibre tangent ogive and are very popular with manufacturers for extremely low-drag bullets.
In my experience, I have seen some manufacturers ‘boost’ the G1 BC to increase sales. Beware of this and test it throughout your load development process.