Rich: The .17 Ackley Hornet is a wildcat, so as such, you must form cases in specialized forming dies, then fireform in the new chamber. Both RCBS and Redding make the dies, but you must have a barrel so chambered so you can fireform. Once the cases are fireformed, you load and shoot as usual, but with much improved performance over the parent case.
It's a great caliber, and I believe only Cooper and Cascade Arms chamber their rifles for it at present. The .17 Mach IV was/is also a wildcat, based on the 221 Fire Ball case, and Remington just made it a factory caliber, calling the "new" round the 17 Fire Ball.
P.O. Ackley says in his books, that the 17 Ackley Hornet is the ideal case capacity and design for the 17 caliber, offering the best efficiency for the bore size. I've been amazed at the accuracy and range possible with the little round. It must be experienced to be fully appreciated.
Here's the standard 22 Hornet case, and a finished 17 Ackley Hornet ready for action:
Fireformed, neck turned, freshly annealed, and 20gr V- Max's coated with WS2 (my rifle is set up with a tight neck chamber):
Positive proof that the little girl DOES shoot (ten shots):
This wildcat is quickly becoming very popular, as it's quiet and cheap to shoot. Many consider it to be the next candidate for becoming a factory round.....we'll see.
