Is it true that the performance of cartridges is reduced when they get very cold?

Shotgun cartridges

MIKE GEORGE

Cartridge performance is reduced when the powder gets very cold, and this does often cause it to burn with rather more residue than normal.

In fact, some of the muck in your barrels was probably partly-burned powder residues.

If you keep the cartridges you are to use on a very cold day in a cupboard in a heated room of your house, then carry them in your coat pockets rather than in a cartridge bag, they won?t get frosted and should deliver normal performance.

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