You can have a rim cutout on a 308 barrel, and shoot both 307 & 308. Rimmed might be easier to grasp with gloves on for extraction, but that’s about it. unless you’re looking at a straight wall cartridge, the encore is gonna headspace off the shoulder....so stuff with wimpy shoulders used with a breach face headspace gap (break open, single shots) are sometimes tempting trouble....35 rem, regular hornet, and such....or so Mike Bellm has told me.
