heard about this one yesterday
It was invented in the 1960s by P.O. Ackley to set a world record for firing bullets at over 5000 fps (1524 m/s). It is based on the .378 Weatherby Magnum cartridge case, necked down to .224 calibre.

that had got me looking for some strange wild cats
the the .17 BMF
Left is a .30-06 Springfield for comparison.
Center is the .17 BMF and right is it's parent cartridge the .50 BMG. :rofl: :rofl: :rofl: always wondered if someone got a .50BMG and necked it down
well here we are

the 22-50 GMC Magnum and 22-50 GMC Short Magnum

.17-357 RG:
