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A barrel vibrates. Vibration by nature oscillates. How and where on the barrel this is determined I don't know. I was taught this years ago by a master gunsmith. It may be old school, and not as affective as once thought, or maybe it is. I was taught that a shorter thick target barrel doesn't change poi with different loads like a slender barrel. The less vibration, the less affect different loads will have on it. I've seen this at the range when a target barrel will be less fussy than a standard field barrel.
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