I have a MK-85 that I bought new when they came out. I have upgraded it to shoot 209 primers. I am looking for the best combination of powder and bullets to get some pretty decent accuracy. I am not having much luck. I have shot Shockley gold powder both 90 and 100 grains with power belt bullets in 215 and 235 and cannot get a decent group. It is real bad and I am about to throw it to the moon.