There are several things that may help your accuracy. 1) Switch to Black Horn 209. I measure by volume and then weigh the powder to be consistent. No crud ring problem either. I pop 2 caps before I load and use consistent pressure on the ramrod. 2) Change bullets; both accuracy and effectiveness will improve using Barnes, Hornady, Nosler or Harvester bullets. Currently I'm using Hornady's 300gr. SST for all my hunting. Hornady has just released a new MonoFlex solid copper bulletin in 250 gr. that looks like a Barnes. Have not had a chance to try it. 3) Use a Federal 209A primer. 4) Experiment with different sabots, based on bullet(s) you end up with. I use Hornady's 3 pedal Low Drag(EZ Load) sabot on their bullets and either a Black or Red Harvester Crush Rib sabot on everything else. Use as many of the same components as you can when working up a load. Saves a lot of time. I started by loads at 90 gr(Vol) and worked up to the 110 gr load I use. I like the heavier bullets because they have better down range performance at 125 yd plus shots we have in West Texas.
All the Barnes I have recovered expanded properly and retained 99% of their original weight. I use a Lead sled from time to time when testing loads, but until you get used to it it's tough to shoot a real tight group. I have 3 Knights, all with bare primer conversions and a new Redemption and all are capable of producing 3 shot 100 yd, groups of 1 inch or less. It took about 4 or 5 months to get it all together, primarily due to the fact that our 90+ daily temps don't let you shoot many rounds at one time. Hang in there. I've parked all my other guns and shoot nothing but MZ's year round.