Hello Im shooting a CVA Optima 50 cal. I use the TC sst sabot 300 grains with 80 grains of loose triple ffg. These shoot great very good groups. They are however very tight going down the barrel, even running a swab every shot.These have a black plastic skirt around them.Do they make a smaller skirt?? I dont use bore butter.Just clean with a solvent and then rem oil when not shooting.Is there a slightly smaller sabot, I can try? I have tried powerbelts they load great , just lousy acuracy. Im really happy with the sst , just wish they were easier to seat. Would bore butter help?Thanks