Noncorrosive Priming Information for U.S. Military Small Arms Ammunition

The following table was derived from US Army Ordnance Corps
documentation. This table lists the first
known lots
noncorrosively primed ammunition
for .30-06, .45 ACP, and .50
Browning Machinegun (BMG) ammunition from the various US military arsenals. All
earlier lots can
be assumed to be corrosively primed.
(If in
doubt, be sure to test each
lot of ammunition and take
appropriate cleaning precautions

Introductory Notes:

Note 1: All earlier ammunition types such as .45 Colt, .38 Colt, .45-70 and
.30-40 Krag can all assumed to be corrosively primed.

Note 2: All US military arsenal produced .50 Caliber spotter-tracer, .30 US
Carbine, 7.62mm NATO, 5.56mm NATO ammunition has exclusively used noncorrosive

Note 3: All post-World War II .38 Special and 9mm Parabellum
pistol ammunition from US military arsenals has used noncorrosive
primers. Definitive priming data for WWII-era .38 and 9mm ammunition is not available.

Note 4: All tracer and incendiary ammunition should be assumed to leave residue
in bores that is hygroscopic and hence have a corrosive effect

Table: Styphnate Primed (Noncorrosive) Small Arms Ammunition Initial Production



1.Odd lots produced with noncorrosive (styphnate) primers since 1947

2. Lots 5967-5999 starting in 7-50 have noncorrosive (styphnate) primers

3. Steel cased lots S-22000-22007 have noncorrosive (styphnate) primers


Disclaimer: The foregoing information is provided as a public
service. It
applies only to ammunition from US military arsenals, and no others.
in doubt about the priming of any particular batch of ammunition, then after
firing, thoroughly clean your firearm’s bore, chamber, muzzle/flash
hider, and bolt face, repeating the cleaning procedure for three
days in a row!

James Wesley, Rawles and will not be held liable for any damage
caused by the use of this public domain information.

Comments are closed.