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If I wanted to stock up more than I have, I would opt for new H335 jug or two. I have and use WC844, that was recovered from 25 year old military ammo that lifed-out. I would hesitate to think it will last another 25. But new H335 should.
And if I were to have only one powder it would be A-2460. It will handle all 223, 308 and many others.
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