Perhaps Mr. Ratcliffe can enlighten us on the lands. Only he knows what he meant for sure, so I won't put words in his mouth, so to speak. I believe the lands comment refers to the lands & grooves in a rifled barrel. The inside of a threaded cap is made the same way, only the rate of twist is different. Whereas a rifled barrel might have a twist of 1 turn in 9 inches, a bottle cap may have 1 turn in 1/8 of an inch.