I would imagine any of the faster magnums (.264WM, 7mm RM, .300WM, etc.) would have similar velocity losses going from 26” to a 22” barrel as the .338WM? Maybe the magnums with fatter cases (Ruger, RUM, WSM, etc), don’t suffer the same velocity loss due to more efficient burning of the powder in shorter barrels? I need to buy a chronograph!What exactly are the velocity losses? How much more bark do you get from the shorter barrels.
I have a 200fps loss in my 308 when shot from a 20" barrel compared with my 22" barrel when using 155 grain projectiles. So unless I am restricting my shots to under 150mts that is a bit more of a loss than what I would want or expect from loosing 2" of barrel. The loss is greater with 130grain projectiles.
Yet with a 35Whelen the loss between 24" and 22" was barely 100fps. I would expect a 338win to loose at least 200fps with a 4" loss of barrel length and it would I suspect bark a lot more. Probably a lot of unburnt powder going out the end.