Encyclopedia · Manufacture, materials, and testing

Proof firing

Proof firing tested a new gun by firing it with a charge heavier than service, to prove it would stand the strains of use before it was accepted.

Also known as: proving a gun.

TestFiring with a charge heavier than service
PurposeProve the gun will stand its strains
FollowsCasting and machining; precedes acceptance

Proving the gun

Before a new gun was accepted it was proved by firing, usually with a proof charge heavier than any it would use in service, and often several rounds. A gun that survived proof without cracking or enlarging had shown it could stand the strains of use.

Proof firing, together with inspection and gauging of the bore, was the test that stood between the foundry and service, and guns that failed were condemned.

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