It's called the .17 Winchester Super Magnum, and it sets a new standard in rimfire performance by pushing a 20-grain bullet to 3,000 fps and a 25-grain to 2,600 fps.
Those are the quickest times ever posted by a commercial rimfire cartridge.
Read the aticle here : .17 Winchester Super Magnum Rimfire Cartridge | Ron Spomer | Gun Blog
May make the .17HMR Redundant after such a short time. Except for the ammo cost.. Mind you .17 at 39.95 for 50 is still 0.79 per shot.
My last .223 got down to 0.59 in bulk...
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