Here's one of those interesting "By the 10's," where the publisher changes as we go! We start with Six-Gun Heroes at Fawcett...
...and now we jump to Charlton!
Issue 30 - as Charlton's using the inventory from Fawcett... at least, the title started with Fawcett inventory when it started!
Issue 60 - by this point, Gunmaster, Charlton's masked superhero-like western character, was taking over!
With issue 84, the book was renamed Gunmaster, but was cancelled in 1967 with issue 89. at which point Judomaster took over the numbering!
Unfortunately for the title, it was cancelled for good with issue 98!
Stick with the Random Acts of Geekery for a new By the 10's soon!