According to my program, that is pretty accurate. Using a 1:18 barrel and 1300fps at muzzle would require a bullett about 1.42" in length to stabalize.

Have you noticed that if the bullet is longer in legth, you can speed it up? According to the program I have the length has more to do with stabilization than does weight.

Thats part of why I do not see a fast twist Knight doing well. In todays world of magnum loads and long range shooting, I don't see the everyday average guy willing to give up the speed, to shoot a fast twist.

Which again would be Knight trying to supply a very small, niche group.