I am trying to get a new .50 Knight Disc rifle to print good groups. I have found out that Hornady's bullets (or the vast majority) have a peak velocity of around 1900 f.p.s. (Hornady makes a magnum XTP bullet, but I could only find it in 300 gr.) My Disc rifle is capable of shooting beyond 2000 f.p.s. with 150 gr. of pellets. The Hornady's tend to open up before impact and tumble when shot from a rifle with a velocity higher than 1900. I am heading out again this weekend to shoot Knight's Red Hot Bullets. These bullets are made by Barnes specifically for Knight. They cost anywhere from $1.50 to $1.90 each, in packages of 10. Expensive, but seem to group well. Or at least they did with my other rifle. Barnes guarantees their bullets at velocities over 3000 f.p.s.
Knight also suggests to start with 100 gr. of pellets, shoot a group of three, then increase the powder charge by increments of 10 gr., shoot another group of three, etc. until you reach 150 gr. pellet charge. Then pull your targets and measure your groups. If you don't like any of the groups, change the bullet weight. Alot of work, and shots, but maybe worth the effort. This is the same procedure most people follow when reloading rifle cartridges and it should have the same results.
I haven't noticed any problems with sabots, but I did notice that Knight Red Hot bullets package says, with new high velocity design, for what that's worth.
