tipiguy,
I am using CCI-200's with 34 grains of H-335 and the Hornady 130 grain SPSSP bullet in my Contender. Very good accuracy and no unburnt powder in the barrel. The 200's work O.K. As some of the other posters mentioned, you may be using too light of a charge of H-335 to get enough pressure to insure good burn, although H-335 is not the cleanest burning powder in the world! Yet, I have used three 8-pound kegs of the stuff in my Contender with the 30-30, 7-30, and 223 calibers--all good shooters with this powder. Good-luck...BCB