Hartmut said:
At this moment I see no way to implement TrailBoss data: First, I do not get any data from the manufacturer. Second, TrailBoss is working very smooth when using a case filling between 65 and 80 percent, above this it produces erratic pressures. I made some tests with 308 Win and 30-06 with a 165grain bullet: When I fill a case to 100% (no air gap between bullet and powder top) I get still get safe pressures about 2500 bars or 36000 psi, but a very high S.D. The pressure jumps about plus-minus 10000 psi up and down. This behaviour cannot be calculated.
I have been spending a lot of time doing rifle loads with TrailBoss. It is now well known that it is difficult to get consistent muzzle velocities using this propellant. However a number of people have attributed this to the low pressure created and maintained in rifles, which results in bullets sticking. They have managed to get much more consistent velocities using moly-coated bullets, or by lubing their barrel between shots.
Hartmut, can you give TrailBoss another shot using low-friction bullets?
