Reply To: Spin stability and drag stability
Typically, airguns which fire bullets as opposed to pellets are listed by their true projectile size. For example, a .25 caliber pellet for an airgun is .250, while one made to shoot bullets is .257. As far as I know, the .257 is the smallest bullet airgun. While that doesn’t directly answer your question, I suspect the bullet advantage for say a .17 caliber is almost nil.
What is more surprising to me, are the really large caliber airguns, like the .457. As I recall, the muzzle energy is over 500 foot-pounds. That’s almost insanity in my opinion.