Nope, 9x23 Winchester:
9x23 WINCHESTER : Ammunition To Go
9x23mm Winchester - Wikipedia, the free encyclopedia
All About 9x23
There have been custom barrel makers producing 1911 barrels specifically for the 9x23 Winchester cartridge. I bought some factory ammo to shoot in my Tanfoglio EAA Witness and it shot great.
I had some after I sold my Witness to finance this Colt. The 9x23 rounds dropped right in the Colt and loaded from the magazine easily enough. They shot great too. Definitely a whole lot more ooomph when touched off than the .38 Super ammo, even the Corbon.
As apples to apples as possible, using Corbon's own data for their hollowpoint ammo, the following info is on their website:
9mm 125 grain hp at 1250 fps = muzzle energy of 434 pounds
.38 Special 125 hp at 950 fps = muzzle energy of 251 pounds
.357 Magnum 125 gr at 1400 fps = muzzle energy of 544 pounds
.38 Super 125 gr at 1325 fps = muzzle energy of 487 pounds
9x23 Winchester 125 gr at 1450 fps = muzzle energy of *584* pounds
.357 Sig 125 gr at 1425 fps = muzzle energy of 564 pounds
.40 S&W 135 gr at 1325 fps = muzzle energy of 526 pounds
.45 acp 165 gr at 1250 fps = muzzle energy of 573 pounds
.45 acp 185 gr at 1150 fps = muzzle energy of 543 pounds
9x23 Winchester wins! When the power factor in USPSA competitive shooting was lowered from 175 to 165, the 9x23 became unnecessary.