I acquired some more reclaimed shot, but this time from J.R. SHOT LLC on ebay (firstname.lastname@example.org
This was clean shot that looked like new other than being dinged. Unlike the dirty Rotometals shot, this stuff was easy to smelt.
Density = 2768 grains/c.i., vs. 2719 gr/c.i. for Rotometals shot.
So right off the bat we know it does not have exactly the same chemical composition as the Rotometals shot. I'm bummed, but that was to be expected for a recycled product.
Air-cooled BHN = 13, vs. 15 for Rotometals shot.
Oven treated @470F = 34 BHN after 16 hours, vs. 40 BHN for Rotometals shot.
After 10 months = 32.6 BHN
SUMMARY: the "J.R." shot is better (harder) than clip-on wheelweight, but not as hard as my sample of Rotometals reclaimed shot.