Ryan,
I went to a gunshow last weekend, and there seemed to be a good bit of powder there.Maybe the problem is relaxing a little. BTW the 50BMG and shotgun powders may be useful in your rifles.The Original H 4831 came from de-mil'ed 50 cal ammo and it was very useful.Also I use a lot of Unique and Red Dot with cast bullets in rifles(and pistols). These are shotgun powers.
Mike