Quote:
Originally Posted by jimbob86
No, but they do speak to the consistency of your loads. Inconsistency = Inaccuracy, over time. You can get lucky with inconsistent ammo ...... once .... to have consistent groups, you need consistent ammo.
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If the barrel muzzle axis shoots slower bullets at a higher angle above the LOS than faster ones, down range groups will be very small. Midrange groups will be larger vertically.
This is called "positive compensation" for velocity spreads and moving weights on the barrel muzzle adjust the muzzle vibration frequency to make this happen.