9×25mm Dillon

The 9×25mm Dillon is a pistol wildcat cartridge developed for use in USPSA/IPSC Open guns. The cartridge is made by necking down a 10mm Auto case to 9 mm.

9×25mm Dillon
9×25mm Dillon (left) next to a 10mm Auto (right)
TypePistol
Place of originUnited States
Production history
DesignerDillon Precision
Designed1988
Specifications
Parent case10mm Auto
Case typeRimless, bottleneck
Bullet diameter.356 in (9.0 mm)
Neck diameter.380 in (9.7 mm)
Shoulder diameter.423 in (10.7 mm)
Base diameter.425 in (10.8 mm)
Rim diameter.425 in (10.8 mm)
Rim thickness.0550 in (1.40 mm)
Case length.990 in (25.1 mm)
Overall length1.250 in (31.8 mm)
Case capacity22.8 gr H2O (1.48 cm3)
Rifling twist1 in 16 in (406 mm)
Primer typeCenterfire large pistol
Maximum pressure37,500 psi (259 MPa)
Ballistic performance
Bullet mass/type Velocity Energy
90 gr (6 g) Gold Dot JHP 2,100 ft/s (640 m/s) 881 ft⋅lbf (1,194 J)
100 gr (6 g) FMJ-RN 2,000 ft/s (610 m/s) 888 ft⋅lbf (1,204 J)
115 gr (7 g) Speer Gold Dot JHP 1,800 ft/s (550 m/s) 827 ft⋅lbf (1,121 J)
125 gr (8 g) FMJ-FP Match or Speer Gold Dot JHP 1,700 ft/s (520 m/s) 802 ft⋅lbf (1,087 J)
147 gr (10 g) FMJ-FP 1,495 ft/s (456 m/s) 730 ft⋅lbf (990 J)
Test barrel length: 6 in (Lone Wolf SS 1:16 in twist)
Source(s):
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