This article needs additional citations for verification. (January 2013)
|Place of origin||United States|
|Manufacturer||North American Arms|
|Parent case||.32 ACP|
|Case type||Rimless, bottlenecked|
|Bullet diameter||.251 in (6.4 mm)|
|Neck diameter||.276 in (7.0 mm)|
|Shoulder diameter||.333 in (8.5 mm)|
|Base diameter||.337 in (8.6 mm)|
|Rim diameter||.337 in (8.6 mm)|
|Rim thickness||.046 in (1.2 mm)|
|Case length||.745 in (18.9 mm)|
|Overall length||.960 in (24.4 mm)|
|Case capacity||9.75 gr H2O (0.632 cm3)|
|Rifling twist||1 in 16 in (410 mm)|
|Primer type||Small Pistol|
|Maximum pressure||23,000 psi (160 MPa)|
|Source(s): Cartridges of the World|
The cartridge was originally conceivedof and prototyped by gunwriter J.B. Wood, and called the "25/32 JBW".
It followed the successful introduction of two other commercial bottleneck handgun cartridges, the .357 SIG in 1994 (which necked a .40 S&W case down to accept .355 caliber bullets); and the .400 Corbon in 1996 (which necked a .45 ACP case down to accept .40 caliber bullets).
According to NAA's website, the .25 NAA's 35 gr bullets travel faster (1,200 f.p.s.) and hit harder (20% more energy on average) than larger, .32 ACP caliber, bullets.
|Wikimedia Commons has media related to .25 NAA.|