The most knowledgeable Ruger guys who I ever met were the Rodischin brothers, Bill and Henry, who had worked for Ruger and then opened Rody's Gun Shop in Newport, NH, just down the road from Ruger's Pine Tree Casting plant. They told me that using cast bullets in the Ruger .44 carbines was a sure way to plug the gas port over time, so they recommended only using jacketed bullets, both in factory ammo and reloads.