RE: First shot on a clean barrel
I target shoot and hunt with a clean bore, always have and always will.
I obtain my best overall POI grouping from a clean bore for every shot. That's what I sight in and hunt hunt with.
Some folks like to fire a squib shot or primers to "pre-foul" the bore. If that works for them I certainly don't wish to change anyone's religion.
For inlines, loadingsabot projectileson a dirty bore is also more difficult loading.
M2C,
Tahquamenon