Quote Originally Posted by angrybear View Post
Yes, but not at sub-12
at sub-12 the diabolo/shuttlecock shape is still best.
Sub-12 or over 12 makes no difference. A subsonic projectile doesn't care if it is over or under 12. Aerodynamic overturning moments don't really care what the muzzle energy is either. The main problem with bullets for air rifles has been the low twist rates and the fact that most of the inventors have not known what they were doing. The design of a successful bullet shape requires the correct balance of aerodynamic and inertial moments coupled with a long wheelbase for inbore behaviour. To design such a projectile needs a knowledge of aerodynamics and ballistics which all too often has been sadly missing resulting in poor designs leading to missleading assumptions on families of projectiles.