Sharpe suggests modifications in wad composition to follow temperature variations. I've never tried to load more than a couple weeks prior to shooting these, so I'm not qualified to answer Walt's query about long term stability. On one hand, some of the cordite formulae did contain as much as 5% petrolatum (akin to vaseline), on the other, anyone who has attempted to use axle grease for a lead bullet lube will tell you the result is an awful lot of "bloopers" or duds.
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