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Not the way I learned. Read about it in The Accurate Riflr many years ago. Vertical stringing is usually caused by stress in the reciever, the rear tang and front of the reciever having stress between them caused by a high spot. Horizontal stringing caused by the barrel bouncing off of one side of the barrel channel. Can be caused by bedding under the chamber not being square across. The puts uneven pressure on the sides of the barrel at that point. Have never seen bullet seating depth cause it. I usually see a group open  some but the group in a well bedded rifle still has a round appearence.