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Re: WD40 and ammo - They don't mix!

Posted By: MGMike
Date: 7/7/20 02:42

In Response To: WD40 and ammo - They don't mix! (Bill in NC)

Keeping WD40 away from ammo is certainly a good precaution, but don't RELY on it to kill primers when making dummy cartridges. The primers in top-quality factory ammunition are extremely well sealed both inside and out and will resist infiltration from WD40.

Some years ago I made some dummies for demonstration purposes from new Remington .44 Magnum cartridges. The bullets were removed with an inertia puller, the propellant dumped, and WD40 sprayed INSIDE the case, which was then left standing upright so it pooled in the bottom. Worst possible scenario for a primer, right? Several days later, the empties were chambered in a single-action revolver and the hammer was dropped on them. EVERY one fired.

Re the OP's experience with East German 7.9 Kurz: if the rust rash on steel cases is scoured off, the original protective lacquer is likely to be removed as well. The best protection to prevent re-rusting is to wax them with a good grade of carnauba-based car wax. Late in WWII, that's what the Germans were doing-- in addition to the lacquer-- to prevent corrosion, but also to ease extraction in MG42s.

M

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