FTA writes …
Muzzle flash! Me running a Glock 20 with 9×25 Dillon conversion barrel at a local IDPA match. Stage required strong hand only shooting. 9×25 is a 10mm case necked down to accept a 9mm bullet.
The 9x25mm Dillon dates back to the late 1980s. The most popular load for this “hand cannon” round is a 115 grain bullet being push out the muzzle at an impressive 1,800 ft/s. This works out to 827 ft/lbs of muzzle energy, more muzzle energy than heavy 10mm Auto loads.