Dogshooter,
One time I threaded a 10/22 barrel for a couple inches with 9/16X12 threads. Then I threaded a 3/4"X5" bolt to match those threads. Then I cut off the 3/4" threads and parted off a little of what was left to use as a jam nut. The .22 normally fired 1 1/2" groups at 50 yards with five Yellow Jackets. When I first started my test I had no idea how much to turn it to effect a change. After the first group I turned it 1/4 of a turn. The group remained the same size but moved toward 10 o"clock by three inches. So I started moving the barrel weight 1/16 of a turn. Eventually I could always get five Yellow Jackets to make 5/8" groups. The weight moved only about .005" and yet accomplished a lot.
