CCI has long been king of the shotshell for handguns, but its engineers had been working on the next generation of products for some time. The idea was simple: deliver more power than the company's standard offerings. It's what customers wanted. As you might have figured out, the name "Big 4" was born straight from the new line's main selling point: Each cartridge is loaded with No. 4 lead shot.
.17 HMR has never been a caliber that's taken well to semi-automatic rifles, but Savage Arms might have rolled out a new answer at SHOT Show 2015's Media Day at the Range.