A very rough rule of thumb is that vintage roll crimp papers fire about 50% of the time at best, its not the powder but the primers. Advances in primer chemistry around the time of WWII which roughly coincides with the advent of star crimped shells alleviated the problem for us vintage shell hunters. Another tip off is if the primer has darkened. The chemical reaction of the priming compound will tarnish the primer from the inside as it degrades.
Good luck in your search.
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"Somehow, the sound of a shotgun tends to cheer one up" -- Robert Ruark
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