Quote:
Originally Posted by longrange1947
An ideally stabilized bullet is under spun at the muzzle, and when it gets to the intended accuracy range is properly spun. The bullet will become over spun at longer ranges.
In most bullet/barrel combinations, this is not an issue, but in some, the bullet "wobbles" around its flight path and the wobble becomes less and less until the bullet settles on that flight path. This causes problems with near range zeros.
The second problem is that the precursory column of air forms a mach disc that can upset some bullets. This requires the bullet to be over spun to maintain accuracy, another problem with transitional ballistics.  |
For what it's worth, Bryan Litz and his partner Nick Vitalbo (
http://appliedballisticsllc.com/about-us/staff/) have done some tests that don't support the theory of a bullet going to sleep as the reason why group size at longer distances are often better than what would be extrapolated from group sizes at shorter distances.
Litz thinks it's using an effectively smaller aiming point at longer distances that produces better groups at distance. Vitalbo thinks its because it's easier to dial out parrallax at longer distances.