Ok so BC is improved with a faster twist which results in lower TOF and lower dispersion from environmental factors. Sounds sweet and explains the 13tw prevalence.
But with a 9tw it seems you also would seemingly magnify wobble from an imbalanced soft projectile.
Are you seeing a dispersion where good lots with very consistent bullets are very good and bad Lots with larger differences in center of mass between projectiles are very bad in the nine twist, but would still be passable in a 13 or 16 twist
Yep, exactly.
Precisely, and the wobble is either non-existent in certain conditions or it's magnified by unfavorable conditions, and this is repeatable/predictable. This is the sole reason I was looking to do a better projectile that isn't a much longer, lathe turned solid. The increased angular velocity of the softer lead projectile means increased deformational pressure based on the Coanda Effect. But when conditions were favorable, the nine twist is pretty incredible.
I generally only shot the best lots I could find through the nine twist so I could eliminate a variable for the sake of sound data. Having said that though, the lesser angular velocity in the slower than nine but faster than 16 proved to be a rather good compromise, but once I experienced what could be done with a nine, I was never too turned on by the 12s and 13s. But I know guys that are doing well with them.
MB