From what I researched before buying a 762/308 can. Most post suggested that a 30 Cal can would not be as quiet as a dedicated 223 CAN. My dealer even express that if I wanted to use it on other rifles, bigger is more versatile. My CAN is rated for up to 338 Lapua, while my largest caliber is 308 Win. It's hearing safe on my 300 Blk Pistol indoors, where I shoot it while waiting for a clerk to get to my paperwork. It will be added to my home defense plan, and knowing it will protect my hearing is a big plus. I certainly will be using it on my 223 AR.