It is made up of whatever was shot on the trap field that it is reclaimed from. That being said, it is mostly 7 1/2 and 8's if it is mined from a trap facility. Cleanliness depends on who processes it. It normally doesn't look shiny like new shot, but it doesn't really need to be shiny. As long as it isn't dirty or filled with rocks, and has been treated with graphite, then all is good.
You will get a ton of guys listing out even more disadvantages of using reclaimed shot. They will tell you it doesn't pattern good because it is mixed sizes and shapes. They will tell you that it doesn't drop well through their loaders, etc. etc etc. I can only say this. I use reclaimed shot almost exclusively. I pay $22.50 per 25 lbs, but when I get it home and weigh it, it is actually 28 lbs. That being said, I load about 16 boxes of shells for $22.50 plus the other components. Comes out to be about $3.25 per box of shells.
I am just an average shooter, but I can tell you that I shoot no better or no worse with reclaimed than I do even with factory shells that are almost twice as expensive. Especially from the 16 yard line.
You have to give it a try for yourself and see what you think. Don't listen to all of the commentary from the naysayers who have never used it and why it is such a bad idea. It is like someone who has never tried chocolate ice cream telling you why it isn't as good as strawberry.
Ditto what t7731 said, he got a better price than I did but I get the same good results, pour it into a shallow container & run a good strong magnet through it. I know they run it through a magnetic separator but I still find some steel shot in it, probably not enough to hurt but I just don't want any scratches in my bbl. Ross Puls
Ditto above although I do add a small amout of graphite when I pour it into the loader bottle I have gotten some bridging and that stops it. I shoot it for everything including handicap and doubles can't tell the difference except the price.
If you like shot that is both clean and shiny then take a look at what the lead miner is offering. The shot I have bought from him in the past is both of those things. Maybe he will dig up a picture and post here.
Now as for the ice cream, a good batch of home made vanilla ice cream with shredded coconut, choped maraschino cherries, and chopped pecans will beat either chocolate or strawberry.
I am reloading all reclaimed. Been using it for a year now. I paid $24 a bag. I cant tell a difference in my scores from the 16 or in handi. I was breaking them just fine from the 27 at a meat shoot a few weeks ago. Works well, and is cheap compared to new shot.
My personal experience with several batches of reclaimed leads me to believe that it all depends on where it comes from and who processes it. A good reclaimer that gets his shot from a place that regularly reclaims and then spends time and effort in the cleaning process (and Leadminer qualifies,from what I've seen of his product)is a good buy SO LONG AS IT'S USED FOR SINGLES AND SKEET!
It may even work for short yardage handicap, but beyond the 20 yd line you better tighten up the choke and may need to slow your loads down to keep the patterns together. I will not use reclaimed for my handicap load because the shot cost is small potatoes compared to what it costs me to attend a shoot that I intend to compete (not just shoot for the fun of it).