Thread: MV SD of wet tumbled brass vs inside dirty.

QuickLOAD predicts a 3ft/sec change in MV for a 0.1gr change in case capacity in a 6.5x47 case, a lesser change in larger cases. On the other hand I have measured at times up to a 25ft/sec reduction in MV from cases with cleaned inside neck surfaces from those where the necks have been lubed with graphite for seating, and usually somewhere between with cases where the neck was left with a residue coating from the previous firing. Certainly any experiment would need to hold the condition of the inside neck surfaces constant. From the QuickLOAD output it seems unlikely though. Burn rate being being influenced slightly?