"I fully understand Sine waves and barrel harmonics. But you stilldida good job explaining that. I am just of the opinion that the bullet has not left the barrel, before the barrel starts to raise(because of the rifle recoiling)."

If that were the case then your accuracy would be in some serious trouble. Either that, or the round would be moving so slow that it would peder out and just drop from the end of your muzzel my friend.