Easiest thing to do right now would be to try some Winchester 777 primers... if you can find them.

Out of my SS Omega I shoot 120gr of loose 777 2f and a 250gr Shockwave. Last year I used to use the Remington Kleanbore primers and did have a bit of issue w/ the crud ring...loading was all but impossible after the 2nd shot.

This year I switched to the Winchester 777 primers and the crud ring issue is non-existant. I can load 5 shots in a row w/o swabbing and not have an issue and no change in impact point. I'm getting 2.5"-3" groups at 150yds w/ this setup. I've been extremely impressed w/ this gun/setup since using this load.