Quote Originally Posted by Geezer View Post

First seen in hand weapons as the 1977-vintage Remington Accelerator, which fired a 55 grain .223" bullet from a 30-30, 308", or 30-06. The sales concept was shoot vermin with a deer rifle. The reality was poor accuracy and high cost, just like the slightly later air gun variant (which, IIRC, used a .168" projectile).
I remember reading a review of the Accelerator in Guns & Ammo. There is also somewhere an article on a necked down .22-250 which fired some kind of .10 calibre needle, apparently used for shooting dragonflies on the wing. Who would want to do that?