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Old 09-20-2019, 01:00 PM
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If you look at Ballistics by the Inch ( http://www.ballisticsbytheinch.com/22mag.html ) for the .22WMR, when BBTI used their chopped test barrel, they didn't go any longer than 19" but for about half the loads, velocity started to fall off between 18" and 19".

However, in their real world tests, using actual rifles, half or more showed modest to significant increases in velocity going from a 21" barrel to a 23" barrel.
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