I have used a 270 as my primary rifle for many years. This year I zeroed my rifle using the Ultra Core-Lokts, their new bonded core-lokt bullet. I shot 7 deer here on the farm. All one shot kills and all complete pass-thrus. You might want to try some different cartridge/bullet combos from Rem and other manufacturers, but it sound to me as those the core-lokts you now use are doing a fine job.