The 9x25mm Dillon
By Chuck Hawks
Randy Shelly at Dillon Precision of Scottsdale Arizona conceived this wildcat for the express purpose of "making major" in IPSC (practical pistol) competition at pressures safe for use in 1911 style pistols. The 9x25 is probably the most successful of several wildcats intended for this purpose. The reason of using a 9mm instead of a big bore to qualify as a major caliber is to reduce recoil, allowing faster recovery for subsequent shots. The 9x25 Dillon design was finalized in 1988 and easily fulfills its mission.
The 9x25 is based on the 10mm Auto case necked down to accept standard 9mm (.355") bullets. The 9x25 case has a sharp shoulder and a very short neck to maximize powder capacity. The case dimensions include a .424" rim diameter, .423" base diameter, .423" shoulder diameter, .382" neck diameter, and 0.99" case length. The overall cartridge length is 1.26".
Springfield Armory has manufactured pistols in 9x25 caliber, and barrels for other 1911 style pistols are available in 9x25 from custom barrel suppliers. Dillon Precision can help with reloading dies and information.
Several powders can be used in the 9x25, including Viht. N105, 2400, and W296. Cartridges of the World includes loads for bullets weighing 100 to 130 grains. A 115 grain JHP bullet can be driven to a MV of 1587 fps and ME of 640 ft. lbs. by 13.0 grains of Alliant 2400 powder, or to a MV of 1566 fps and ME of 625 ft. lbs. by 15.0 grains of W296 powder.
14.4 grains of W296 powder can drive a 124 grain FMJ bullet to a MV of 1529 fps and ME of 640 ft. lbs. These loads are credited to the Lyman Reloading Handbook and were derived in an 8" barrel.
At one time the 9x25 Dillon was considered for commercial introduction, but the interest in the cartridge seems to have faded. Probably the success of the .357 SIG undercut interest in the 9x25.
Copyright 2006, 2013 by Chuck Hawks. All rights reserved.