Sterling Round/bar Question

Hi all-
I have a buddy who might be selling some silver, but he has a good amount of STERLING rounds and bars. I'm pretty sure its a lot of loose Franklin mint stuff and the like. I dont want to rip him off but I also want to make a little profit, are rounds and bars just bought as sterling scrap? What's usual, about 70% of melt?
Thanks in advance!
wags
I have a buddy who might be selling some silver, but he has a good amount of STERLING rounds and bars. I'm pretty sure its a lot of loose Franklin mint stuff and the like. I dont want to rip him off but I also want to make a little profit, are rounds and bars just bought as sterling scrap? What's usual, about 70% of melt?
Thanks in advance!
wags