No doubt without looking, overbore cartridges like the .243 have the most to lose.
But here's some tests anyway. The Creed fared much better than I would've thought. The heavier/longer 142 SMK only lost 101fps going from 27 to 18 inches. Case design?
https://rifleshooter.com/2016/04/243-winchester-effect-of-barrel-length-on-velocity/https://rifleshooter.com/2016/02/6-...ngth-on-velocity-cutting-up-a-creedmoor/The velocity figures on the Creed look low across the board though. Maybe tainted by powder selection?
