I know it is a much debated issue among gurus. I know ammo companies position on this and powder companies too.
Personally, I think it does not matter much for short periods of time if the powder is already fast burning or in generally good condition. But those old rifle rounds look real old and beaten. I have fired quite a few of similar looking with no issues and no tumbling except for a foul ammonia odor after firing, which is not present on newer rounds, and maybe slightly greater pressure felt. So why bother with the risk ? if the powder is indeed really old, then some of the warnings may become reality with it breaking down easier.
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