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SAAMI's tests on barrel length versus muzzle velocity showed that bullets in the velocity range the .300 Win Mag shoots them, there's about 30 fps change per inch of barrel length.
It's not unusual to have a 24" barrel shoot the same load's bullets out 50 fps faster than a 26" one because its internal dimensions are smaller. So, if you're comparing barrel lengths to velocity changes, the only difference has to be the barrel length; that rarely, if ever, happens with two different rifles. Otherwise, all sorts of variables can cause incorrect results.
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