Overlapping firing of rocket gun and rifle gun is applied frequently in the modern warfare, but the common method of fire distribution is definitely prescribed in the existing Artillery Firing Manual.

And, lowering his rifle, he took aim at the captain of the gun, who, at that moment, was bearing down on the breach of his gun and rectifying and definitely fixing its pointing.

In 1635 the word rifle appeared in English in a patent for cutting these grooves in gun barrels.