Summary: In 308Win you lose about 25 fps per inch cut off.
http://www.thefirearmblog.com/blog/2015/02/04/rifleshooter-coms-barrel-length-velocity-tests/?utm_source=Newsletter&utm_medium=Email&utm_content=2015-02-10&utm_campaign=Weekly+Newsletter
I recall taking a used 30" target barrel and cutting it back to 20" for a project. We used a hacksaw in the back yard and cut it off in 1" pieces and Chronied it all the way. The average was about 30 fps per inch - similar to the published report. I was surprised at how small the velocity loss was.
http://www.thefirearmblog.com/blog/2015/02/04/rifleshooter-coms-barrel-length-velocity-tests/?utm_source=Newsletter&utm_medium=Email&utm_content=2015-02-10&utm_campaign=Weekly+Newsletter
I recall taking a used 30" target barrel and cutting it back to 20" for a project. We used a hacksaw in the back yard and cut it off in 1" pieces and Chronied it all the way. The average was about 30 fps per inch - similar to the published report. I was surprised at how small the velocity loss was.
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