hi guys.... my question.. whats the twist rate in 30.cal ST barrel...or its the same like in 25.cal(1-32)?thx 4 the answer...
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fx impact twist rate...
- Thread starter JAM
- Start date
The actual stamped (pressed) twist on the end of the barrel is not what you get. The pellets skid on the smooth twist rifling and thus take on a significantly slower rate.
The thing about this is that different pellets, and even different velocities with the same pellet, will change how much the pellet spins once it is outside the barrel. A lighter pellet that has fairly large engagement surface at slower velocity will spin at a faster rate than will a heavier pellet with less engagement at higher velocity. The lighter slower pellet has less inertia to prevent it from spinning.
If you are wondering how long a bullet can be and still be stabilized, I think it would be an exercise in futility. The effective twist rate probably won't stabilize much of any solid based bullet well. You might get lucky here and find a combination that works, but that would probably be an exception.
Hollow based diabolo shaped pellets don't need much in the way of spin to be stable. That is why those barrels work and tend to work well.
The thing about this is that different pellets, and even different velocities with the same pellet, will change how much the pellet spins once it is outside the barrel. A lighter pellet that has fairly large engagement surface at slower velocity will spin at a faster rate than will a heavier pellet with less engagement at higher velocity. The lighter slower pellet has less inertia to prevent it from spinning.
If you are wondering how long a bullet can be and still be stabilized, I think it would be an exercise in futility. The effective twist rate probably won't stabilize much of any solid based bullet well. You might get lucky here and find a combination that works, but that would probably be an exception.
Hollow based diabolo shaped pellets don't need much in the way of spin to be stable. That is why those barrels work and tend to work well.
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