Re: Flash hole deburring?????
Its not the flash hole deburring. That will create a more constant burn but wont increase the speed under same conditions
Scale could be off
Air Temp could now be warmer
Ammo temp could now be warmer
Alitude could be different.
Scope could be off
Rifles initial zero could have moved due to any number of reasons.
I could go on for hours here. LOL