Shame that a film with him and Eastwood never happend.

I read that Sergio Leone considered Bronson for the Lee Van Cleef roles in both For a Few Dollars More and The Good, The Bad, and The Ugly but Charlie turned them down. And of course Leone thought of Bronson even before Clint for A Fistful of Dollars. I think Bronson turned it down because he didn't think the script was any good.

I could be wrong but I do remember reading that Charles and Clint did share a few scenes together on an episode of Rawhide.

Bronson and Eastwood were easily the biggest action stars of the 70s, you would think that someone would've tried to get them in a film together. I could've pictured them either as enemies in a Western or playing allies in a cop film. Maybe it didn't happen due to ego.