Agent 47 of the Hitman game series uses customized twin Hardballers as his signature weapons.
Unfortunately, the weapon was horribly unreliable with the hollowpoint ammuniton of that era (80's) and was given the nick-name 'Hardballer' as it would only feed 'hardball' or full-metal jacket ammunition with any reliability.
AMT latched onto the title and began selling it as a target pistol, and even produced a six-inch 'Longslide' version for match-grade uses. Finishes offered were natural stainless and hard chrome, a non-shiny version of the metal popular in the 70's and 80's because of its corrosion resistance.
The 'Silverballer' seen in the popular 'Hitman' video game series is an AMT Hardballer with a polished nickel or chrome finish, a custom feature which would also suggest that the feed ramp had also been polished (now standard on 1911's), which would make feeding hollow-point ammo a breeze.
AMT went out of business about a decade back, and as such 'Hardballers' are something of a collector's item these days.