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For the .223 cartridge, how much do you give going from a 20" barrel to 18", 17", 16" ?
There was a recent article on the .308 Winchester and barrel length. They found that by going from 20" to 18", very little performance was lost (about 200 fps if I remember right)
Thanks.
 

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From what I've read, it dosen't affect accuracy, as it does longer range energy retention.
 
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