55 grain bullet out of a 1:7 Twist Barrel ?

[charlie b]

To be honest, never heard of " over stabilization " of a bullet. What does that do, if anything, to impact performance?

Short answer is it does not affect bullet performance in most cases and really only comes into play at very long range and/or large trajectories.

Over stabilization is when the projectile is spinning much faster than required for keeping it stable. The result is the nose of the bullet will not stay pointed in the direction of flight, ie, it will fly 'nose up'. You'd have to shoot at a much longer range to see any effects from this. The only time it is critical is in artillery when you need the nose of the projectile to hit with the nose at a specific angle to the target.