As far as In goes, wouldn't that then apply to most missile weapons?
Good point.
SD....come on...lag? I can't see that one myself.
Depends on how old the tech is, as I said. If we're talking about flintlock or matchlock weapons, we're talking about the click of the trigger, the flash of the primer, the boom of the charge, taking place over
about the amount of time it takes to say "click-flash-boom." So yes, the same kind of self-discipline it takes to hold a video camera steady, back in the day before the circuitry helped keep things centered.
"Gunpowder weapons" encompasses weapons dating back to Henry V and Joan of Arc. Quite aside from time lag between trigger pull and firing, I'd expect it to take a lot of courage to fire a 15th or 16th century blunderbuss,
or for that matter to stay within 20'-30' of anyone who did. Being too close to such early, cutting edge tech is as full of unknown hazards as hanging around an early atomic pile, for much the same reasons.