Developed by John Browning in 1905 and adopted by the U.S. Military for the 1911 Pistol. Replaced in 1985 as the U.S. Military handgun cartridge by the 9mm.
New Production Ammo can be found manufactured by practically everyone.
Surplus Ammo - Found all over the place.
Reloading Dies are made by Dillon Precision , RCBS, Redding, and Lee Precision , to name a few.
Reloading components can be found at Huntington's, Midway USA , and the Wholesale Hunter , to name a few.
Brass - Almost all US manufactured ammo produces good once shot brass and components abound.