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As propellants are either/and nitroglycerin or nitrocellulose – both which destabilize(outgas) an acidic compound, our ethylene/glycol based PC deteriorates. The slow (double based) powders typically have more stabilizers added ( reduced outgassing) therefore the effect is less pronounced. Solution? Switch to Hitek, use a paper GC, wipe the base with liquid wax, etc. I don’t use any of theses powder so not my problem. As the outgassing is NORMAL, performance of powder will NOT change. Old powder is old powder.

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