Listen to me...very carefully....DO NOT reuse that powder from those shells.
There is no way in the world you can know what it is. Heck, the maufacturers probably couldn't tell you for certain.
I'd hate for you to blow yourself up just to save a few dollars. Same for the primers, if you've pulled the bullets, you might as well resize the cases and start from scratch.
The amount of whatever powder you use should come from a good reloading manual, preferably two manuals.
As for the dents on the shoulder, those sound oil dents, as if they have been reloaded.
If they aren't major dents, they probably won't hurt anything but your accuracy, when you fire them, they should return to normal.
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