I downloaded and printed the instructions and applied them to strip my rifle and put it back together again. It is a simple process without any head-scratching, and all went extremely well. I couldn't find any issues that might be scraping my brass, but in the action, there were a great number of tiny bits of brass, so this has been going on probably since the rifle was new. I polished the carrier which didn't appear tohave any sharp corners, and re-assembled the rifle. I coated a cartridge with felt pen and cycled it. No more scrapes!!
So thanks for steering me in the right direction...a total success.