I dont believe the Americans or Germans used Cordite.
However there Germans used Steel cases that seem to react with their powder. Although the ball seems nice on the outside the case and projectile are corroded as well as the charge degraded.
The best you can hope for is a weak charge that produces enough pressure to push the bullet out the muzzle. The worst is a blocked bore.
The American stuff from the 1950s suffers from a charge degradation also.perhaps from the breakdown of the powder? Although the cases are brass,the powder is clumsy,has produced gas as well as the copper jacket of the projectiles corroded.
Frankly there is no ammo like new ammo.
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