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Why does a warm / hot rifle shoot better?


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A warm barrel wouldn't shoot any better than a cold barrel if the barrel remained cold.

But as a barrel warms the steel expands changing the point of impact.

Once the barrel achieves it's normal operating temperature the groups will settle down.

If you increase or decrease your rate of fire your group's point of impact will change slightly again.

Bull barrels are used to reduce this effect as well as stabilize the firearm.

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