Clearly you do not know what you are talking about. If it was a myth, it would not be well documented. All it meant is the rifle displayed superior accuracy in testing. It is not like they were sniper rifles, all it was, was that particular rifle showed a better result on the initial tests. Superior accuracy likely meant, the standard is 'X' at 100m, this rifle did better than that.
Most rifles were only fired with a proof round . Please show me the Italian military document that supports what you say .